Notes, summaries, assignments, exams, and problems for Competitive examination

2

Who can provide rail services?

Only companies licensed by the Ministry. Revised every five years, the license must be registered and valid in the EU. Companies must provide traction and be registered as S.A.s when required. Except for the operator RENFE, applicants must demonstrate the financial capacity to meet obligations for 12 months and must employ professional, liable staff. RENFE has six months to apply for the license and two years to approve personnel.

Material and service providers must obtain a security certificate in advance (issued by ADIF or another entity authorized by law) covering movement, safety and material characteristics.

Special tax regime and economics

What does it cost to be a railway undertaking (RU)? Businesses must...

Understanding Inheritance in OOP

In object-oriented programming, Inheritance is a mechanism where a new class (derived class) acquires the properties and behaviors (data members and member functions) of an existing class.

Types of Inheritance

• Single Inheritance: In single inheritance, a single derived class is inherited from only one base class. It is the simplest form of inheritance.
• Multiple Inheritance: Multiple inheritance occurs when a single derived class is inherited from more than one base class.
• Hierarchical Inheritance: In this type, multiple derived classes are inherited from a single base class.
• Multilevel Inheritance: In multilevel inheritance, a derived class is inherited from another derived class, creating a chain of inheritance.
• Hybrid

Understanding the BCG Matrix: Product Portfolio Strategy

The Boston Consulting Group (BCG) Matrix is a strategic tool used to analyze a company's product portfolio based on market share and market growth. It categorizes products into four quadrants, each with distinct characteristics and strategic implications.

Stars: High Growth, High Share

Characteristics of Stars

• Stars are products with high market share in high-growth markets.
• They are highly profitable and generate significant cash.
• Their high growth also means they require substantial cash to finance working capital and build capacity.
• Therefore, although profitable, Stars can have positive or negative net cash flow.
• Over time, as market growth slows, Stars often evolve into Cash Cows.

Strategic

Office Facilities and Personnel

• Assist: Be in charge of, describe, develop, explain how to use, hire (contatar), sell.
• Cafeteria: Car park, conference room, ground floor, kitchen, lobby, maintenance, reception, stockroom, toilet, top floor, warehouse.
• Appointment (cita): Business card, clerk (dependiente), do business, employee, employer, escalator, interview, name plate, receptionist, research and development department, title.

Administrative Tasks and Business Operations

• Answer incoming calls: Data entry, deliver the message, distribute the incoming mail, file documents (archivar), keep a log (mantener registro), keep track of (llevar registro), order supplies, prepare a presentation, receive visitors, schedule a meeting, screen a call, search

Present Simple (Yo voy)

He/She/It - goes (Do/Does?)

Habit or routine, general truth

• Always
• Usually
• Generally
• Regularly
• At night
• In the morning
• Every week

Present Continuous (Estoy jugando)

am/is/are + -ING

Action which is happening now, temporary action

• Now
• Right now
• At the moment
• Today
• This month
• Next day

Past Simple (Caminé)

-ED / 2nd col. (Did?)

Completed action in the past

• Yesterday
• Last week
• A year ago
• In 2007
• When

Past Continuous (Estaba estudiando)

was/were + -ING

An incomplete action in progress in the past

• Last night/week
• When
• While
• As

Present Perfect Simple (He trabajado)

have/has + -ED/2nd col.

An action that began in the past and continues until the present

• Ever
• Never
• Already
• Just
• Yet
• Recently
• For
• Since
• In recent years

Past Perfect Simple (Yo había llegado)

Had + -ED

A completed...

Indirect Pulp Capping

Indicated in deep caries near the pulp without signs or symptoms of pulpal involvement. Goals are to avoid pulpal exposure and block the passage of bacteria. Success is defined by:

• Absence of signs and symptoms of pulpal pathology.
• Correct isolation.
• Careful cleaning of axial walls.
• Good seal of restoration margins.

The procedure involves:

1. Elimination of infected dentin.
2. Placing a biocompatible material on the layer of demineralized, uninfected dentin to inactivate remaining bacteria.
3. Remineralizing the lesion by forming reparative dentin.

Materials include: Zinc oxide eugenol and Dycal.

Direct Pulp Capping

Indicated in temporary teeth only when the pulp has been inadvertently exposed during an operative procedure. The tooth must...

First of all. From my point of view. To begin with. That's why. Anyhow(de todas formas) Anyway (de cualquier manera) Meanwhile. Until then (hasta entonces) In short (en resumen) To sum up. After all (al fin y al cabo) All of sudden(de repente) As I pointed in (segun quedo indicado en) As far as i know (que yo sepa) It is strange that (es raro que) It just so happened that (da la casualidad que) it turns our that (resulta que) the way i see it( a mi modo de ver)

Around 40,000 BCE, the first humans lived in China. Cultivation began around the Yellow and Yangtze Rivers. The Yangshao and Longshan cultures were the earliest settlements. There was a big difference between northern and southern agriculture. The Tibetan Plateau and the Gobi Desert were the natural barriers of the Chinese civilization.

The Shang Dynasty

The Xia was the first dynasty in China, around 2000 BCE. It was replaced by the Shang Dynasty around 1600 BCE. Shang China was governed by a warrior aristocracy. The rulers in Anyang ruled with local and central bureaucracy, but it wasn't hereditary. The king's position was demonstrated by the large sacrifices at his death. He was an intermediary between Heaven and Earth. Socially, the village/...

Advantages of International Trade

• Comparative Advantage: Specializing in goods with a lower opportunity cost increases economic welfare for all nations. Free trade allows countries to focus on their comparative advantage.
• Increased Exports: Beyond consumer benefits, firms exporting goods gain significant economic welfare. Lower tariffs on exports boost job creation and economic growth.
• Economies of Scale: Specialization allows industries with high fixed costs to benefit from economies of scale, leading to lower average costs, reduced consumer prices, and greater firm efficiency.
• Increased Competition: International trade forces domestic firms to compete with foreign entities, incentivizing cost-cutting and efficiency while preventing domestic monopolies

Melody and Melodic Concepts

Melody: a succession of sounds, normally with different pitches and durations, that expresses a musical idea. They are structured in phrases (phrases are separated by cadences).

Motif, Phrase, Cadence, Theme

• Motif = word
• Phrase = grammatical sentence
• Cadence = pauses
• Theme = main idea

Ambitus (Range)

Ambitus: the range of pitches a melody covers, from the lowest to the highest note.

Melodic Motion

Melodic motion: the line or direction that the notes follow in a melody.

Interval

An interval is the gap between two notes.

• Melodic (horizontal): when the notes sound successively.
• Ascending: from a low note to a high note.
• Descending: from a high note to a low note.
• Harmonic (vertical): when two notes sound simultaneously.

Edge of hole