废气涡轮增压器使柴油机的功率增加一倍，而重量只增加（）。

【名词&注释】

柴油机(diesel engine)、中心线(center line)、标准时(standard time)、光学仪器法

[单选题]废气涡轮增压器使柴油机的功率增加一倍，而重量只增加（）。

A. 30%
B. 20%
C. 10%
D. 5%

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学习资料：

[单选题]相邻轴轴心线相交，但相邻轴两法兰中心未对准，其连接法兰处偏中值为（）。

A. δ＝0、φ＝0
B. δ＝0、φ≠0
C. δ≠0、φ＝0
D. δ≠0、φ≠0

[单选题]测量轴系中心线同轴度偏差，可采用（）。Ⅰ.平轴法；Ⅱ.平轴计算法；Ⅲ.直尺-塞尺法；Ⅳ.指针法；Ⅴ.光学仪器法。

A. Ⅱ＋Ⅲ
B. Ⅰ＋Ⅱ＋Ⅴ平轴法
C. Ⅰ＋Ⅱ＋Ⅳ
D. Ⅰ＋Ⅲ＋Ⅳ

[单选题]当铁梨木艉轴承的轴承间隙和铁梨木板条厚度均不合标准时，应采用（）修理。

A. A．换新铜套
B. B．换轴承
C. C．换下瓦
D. D．换艉轴

[单选题]About half an hour before the engine is required, cooling water at （） must be circulated.

A. more than the working temperature
B. less than the working temperature
C. the working temperature
D. the same as the surrounding temperature

[单选题]Increased air （） will raise scavenge efficiency and allow a greater mass of air to be compressed； more fuel may now be burned giving an increased power.

A. specific volume
B. density
C. viscosity
D. calorific value

[单选题]The injector pump is operated by a cam which drives （） up and down.

A. the needle valve
B. the plunger
C. the piston
D. the cylinder

[单选题]The operation between two fuel injections is called a working cycle, which consists of a fixed sequence of eventsWhat does "which" mean in this sentence?（）

A. a working cycle
B. the operation
C. two fuel injections
D. event

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