二冲程十字头式柴油机活塞运动部件的平台检验主要是检查（）零件

【名词&注释】

活塞杆(piston rod)、十字头(crosshead)、二冲程(two-stroke)、柴油机活塞(diesel engine piston)

[单选题]二冲程十字头式柴油机活塞^{(diesel engine piston)}运动部件的平台检验主要是检查（）零件间的相互位置关系。

A. 活塞和活塞杆
B. 十字头、滑块和连杆
C. 活塞运动部件
D. 机座固定件

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学习资料：

[单选题]某船在航行速度为16kn时的运动阻力为12O0kN，其船舶有效功率为（）kW。

A. 1200
B. 9869
C. 16000
D. 19200

[单选题]相邻轴轴心线相交，但相邻轴两法兰中心对准，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]Cylinder liner cooling is often referred to as （）.

A. piston cooling
B. sleeve cooling
C. central cooling
D. jacket cooling

[单选题]Main bearings are required to support the crankshaft at each （）.

A. end
B. web
C. pin
D. journal

[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]Remote control means that the system is being controlled by the operator who is situated （） from the system.

A. automatic
B. local
C. remote
D. manual

[单选题]Shims of different thicknesses are inserted between the shells to enable adjustment of （）.

A. the bearing clearances
B. the bearing thickness
C. the bearing strength
D. the bridge hardne

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