海船船员考试

单选题What type of electric motor is most commonly used on board ship?（）A non-synchronous electric motorB synchronous electric motorC fully enclosed electric motorD watertight electric motor

题目
单选题
What type of electric motor is most commonly used on board ship?（）
A

non-synchronous electric motor

B

synchronous electric motor

C

fully enclosed electric motor

D

watertight electric motor

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相似问题和答案

第1题：

In an AC.synchronous motor electric propulsion plant,propeller speed is controlled by()

A.prime mover speed

B.number of energized main motor poles

C.propulsion generator field strength

D.electric coupling field strength


答案：C

第2题：

what is “board sling” used for?


正确答案：It is used to carry the general cargoes during cargo handling.

第3题：

What type of extinguisher should be used for an electric fire? ________

A.CO2

B.Form

C.Water

D.Water and Form


正确答案：A

第4题：

The keyboard of a typewriter refers to the set of keys in it.Most typewriters have"qwerty"key-boards.The name crones from the first six letters on the board′s second line.The"qwerty"board was?set up by C.L.Sholes,who was the first man to make a really good typewriter.
Some letters,such as S and T,are used together a great deal in English.Sholes placed such?pairs of letter far apart on his keyboard.This made it harder for typists to learn the keyboard.But it?helped keep typewriters from jamming.On early machines the bars holding the letters often caught on?each other when moving quickly.
Sholes made the name of his machine easy to type.lie placed on the same line all the letters of?the word"type"and"writer".

The"qwerty"board is named for the__________.

A.man who set it up
B.company that sold it
C.order of six of its letters
D.letters used the most in English

答案：C
解析：
qwerty是由键盘上6个字母按顺序排列起来组成的。故选C项。

第5题：

The most commonly used locking level in implementing concurrency control is at which of the following levels?

A．database

B．table

C．record

D．field


正确答案：C

第6题：

_____ the engines, the diesel engine is ____ used engine on board

A.Between / more commonly

B.Among / the most commonly

C.Between / not more commonly

D.Among / not the most commonly


正确答案：B

第7题：

what do you think is the most important thing on board?


正确答案：Safety first.

第8题：

___endorsement is the simplest and the most commonly used form. of endorsement.

A.blank

B.restrictive

C.special

D.qualified


正确答案：A

第9题：

The keyboard of a typewriter refers to the set of keys in it.Most typewriters have"qwerty"key-boards.The name crones from the first six letters on the board′s second line.The"qwerty"board was?set up by C.L.Sholes,who was the first man to make a really good typewriter.
Some letters,such as S and T,are used together a great deal in English.Sholes placed such?pairs of letter far apart on his keyboard.This made it harder for typists to learn the keyboard.But it?helped keep typewriters from jamming.On early machines the bars holding the letters often caught on?each other when moving quickly.
Sholes made the name of his machine easy to type.lie placed on the same line all the letters of?the word"type"and"writer".

This article is mostly about a__________.

A.pair of letters
B.keyboard
C.language
D.man's life

答案：B
解析：
从第一段第一句可知，这篇文章主要谈论的是keyboard。故B项正确。

第10题：

The keyboard of a typewriter refers to the set of keys in it.Most typewriters have"qwerty"key-boards.The name crones from the first six letters on the board′s second line.The"qwerty"board was?set up by C.L.Sholes,who was the first man to make a really good typewriter.
Some letters,such as S and T,are used together a great deal in English.Sholes placed such?pairs of letter far apart on his keyboard.This made it harder for typists to learn the keyboard.But it?helped keep typewriters from jamming.On early machines the bars holding the letters often caught on?each other when moving quickly.
Sholes made the name of his machine easy to type.lie placed on the same line all the letters of?the word"type"and"writer".

Sholes put S and T far apart because__________.

A.he hoped to prevent jamming
B.they are seldom used together
C.neither is a vowel
D.there wasn't room for them together

答案：A
解析：
由文章中第二段第四句“But it helped keep?typewriters from jamming．”可知A项符合文章意思。

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