（） water is more expensive than fresh water It has high sp

【名词&注释】

螺旋桨(propeller)、光学仪器、排气阀(exhaust valve)、轴系理论中心线

[单选题]（） water is more expensive than fresh water It has high specific heat and low viscosity.

A. Distilled
B. Distilling
C. Boiling
D. Boiled

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学习资料：

[单选题]在高增压柴油机上，排气阀阀盘的温度可达（）℃。

A. A．650～800
B. B．450～600
C. C．500～650
D. D．450～500

[单选题]轴系理论中心线是（）的定位安装基准。

A. 螺旋桨
B. 舵系
C. 中间轴
D. 主机

[单选题]轴系若按直线校中，采用的校中工艺方法是（）。

A. 测法兰对上的偏中值
B. 光学仪器校中法
C. 拉线法
D. A或B

[单选题]For an ordinary four-stroke engine the exhaust valves open （）.

A. after TDC
B. before TDC
C. after BDC
D. before BDC

[单选题]Pistons of marine medium speed diesel engines may be made of （） in order to keep the weight down for balancing purpose at high speed.

A. lead
B. forged steel
C. alloy steel
D. aluminum alloy

[单选题]The piston rings are manufactured with a diameter （） the bore of the cylinder.

A. larger than
B. smaller than
C. equal to
D. none of the above

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