For a diesel engine, when the piston is at the （）, the cle

【名词&注释】

可靠性(reliability)、特殊性(particularity)、动力装置(power plant)、排气阀(exhaust valve)

[单选题]For a diesel engine, when the piston is at the （）, the clearance volume is the largest.

A. TDC
B. DTC
C. BDC
D. DBC

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[单选题]由于船舶的特殊性，使动力装置的可靠性更为重要和复杂。它与下列因素有关（）。Ⅰ.各组成设备的可靠性；Ⅱ.各组成设备的维修性；Ⅲ.管理人员的因素

A. 仅Ⅰ对
B. Ⅰ+Ⅱ
C. Ⅰ+Ⅲ
D. Ⅰ+Ⅱ+Ⅲ

[单选题]柱塞套筒进行滑动试验时，一般将柱塞抽出1/3左右后观察其（）的情况。

A. 有无卡住
B. 下滑速度
C. 表面损伤
D. 表面变形

[单选题]在高增压柴油机上，排气阀^{(exhaust valve)}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]由于铁梨木需进口，价格较高，故采用（）作为铁梨木的代用材料。

A. 尼龙
B. 桦木层压胶木
C. 橡胶
D. 赛龙

[单选题]Oil is supplied to the cylinder wall and （） by means of mechanical lubricators.

A. the cylinder cover
B. the piston rings
C. the piston crown
D. the piston skirt

[单选题]To prevent the build up of high stresses engine must not be run continuously （）.

A. faster than dead slow speed
B. slower than dead slow speed
C. with the output of MCR
D. at critical speed

[单选题]A diesel engine cooling water system with a pH factor of 30 indicates a condition of （）.

A. slight acidity
B. slight alkalinity
C. excessive alkalinity
D. excessive acidity

[单选题]On a twin-screw，twin-rudder vessel，the most effective way to turn in your own water，with no way on，is to put（）.

A. one engine ahead and one engine astern，with full rudder
B. one engine ahead and one engine astern，with rudders amidships
C. both engines ahead，with full rudder
D. both engines astern，with full rudder

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