正确答案: D

tolerance

题目：Before replacing a piston you should check the rings to see that all clearances and gaps are within the permissible （）.

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学习资料的答案和解析：

[单选题]艉轴管装置的主要作用是（）。Ⅰ.支承，Ⅱ.减磨，Ⅲ.密封，Ⅳ.散热，Ⅴ.构成轴系。

Ⅰ＋Ⅲ

[单选题]尾轴锥形轴段出现裂纹的主要原因是（）。Ⅰ.疲劳；Ⅱ.振动；Ⅲ.撞击

Ⅰ+Ⅱ+Ⅲ

[单选题]舵杆轴颈表面腐蚀面积＞25%总面积时，应进行（）。

堆焊后光车

[单选题]Before "stand-by" is rung on the engine telegraph, it is usual to give the main engine （） ahead and astern.

a brief trial on power

[单选题]The cooling water jacket is common to all the cylinders but there are often （） to ensure that each cylinder receives the right amount and flow of water.

dividing walls

[单选题]The four strokes are called suction, compression, expansion and exhaust, but only （） stroke provides the power to drive the ship.

expansion

[单选题]What is the operating principal of a flash type evaporator?（）

Heated sea water is injected into a vacuum chamber