连杆大小端轴承孔平台检验时应检查二者的中心线的（）。

【名词&注释】

环境温度(ambient temperature)、柴油机(diesel engine)、船舶动力装置(marine power plant)、中心线(center line)、正确理解(correct understanding)

[单选题]连杆大小端轴承孔平台检验时应检查二者的中心线的（）。

A. 垂直度
B. 在垂直平面和水平平面内的平行度
C. 平行度
D. 同轴度

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学习资料：

[单选题]柴油机冷态即环境温度下测量曲轴臂距差具有测量值（）。Ⅰ.准确；Ⅱ.符合规范；Ⅲ.稳定；Ⅳ.便于操作；Ⅴ.不受温度影响。

A. Ⅰ＋Ⅲ＋Ⅳ
B. Ⅰ＋Ⅳ
C. Ⅱ＋Ⅳ
D. Ⅰ＋Ⅳ＋Ⅴ

[单选题]艉轴铜套产生（）时，应采用换新铜套。Ⅰ.磨损；Ⅱ.腐蚀；Ⅲ.壁厚过薄；Ⅳ.套合松动；Ⅴ.接缝渗水。

A. Ⅱ＋Ⅲ
B. Ⅰ＋Ⅱ＋Ⅳ
C. Ⅲ＋Ⅳ＋Ⅴ
D. Ⅰ＋Ⅲ＋Ⅳ

[单选题]备车的正确理解^{(correct understanding)}是（）。Ⅰ.保证船舶开航；Ⅱ.保证船舶机动航行；Ⅲ.保证船舶动力装置及设备处于随时可启动和运行

A. Ⅰ+Ⅱ
B. Ⅰ+Ⅲ
C. Ⅱ+Ⅳ
D. Ⅰ+Ⅱ+Ⅲ

[单选题]In order to ensure the safety of the ship and its equipment during UMS operation, certain essential functions （）.

A. must be provided
B. may be provided
C. have provided
D. can be provided

[单选题]The crankshaft is of the semi built type, with the journal （） the forged or cast steel crank throws.

A. being shrunk into
B. to be shrunk into
C. to be shrunk with
D. shrinking into

[单选题]The cylinder covers and the liners are bolted together by means of （）.

A. bolts welded into the cylinder head
B. bolts welded into the cylinder frames
C. studs screwed into the cylinder head
D. studs screwed into the cylinder frame

[单选题]The sealing rings are in four parts and pressed together around the piston rods by means of （）.

A. nuts
B. bolts
C. coil springs
D. stuffing boxe

[单选题]When to remove scale from the cooling spaces, acid solution （） in the system can be tested from time to time by putting some on to a piece of lime.

A. strength
B. dense
C. percentage
D. velocity

[单选题]Temperature control valves installed in the jacket cooling water system of a diesel engine modulates the rate of water flow through the （）.

A. cooling water pump
B. nozzle cooling passages
C. cylinder jackets
D. heat exchanger

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