反映舵杆轴颈磨损的指标有（）。

【名词&注释】

环境温度(ambient temperature)、柴油机(diesel engine)

[单选题]反映舵杆轴颈磨损的指标有（）。

A. 圆度、圆柱度
B. 圆柱度、椭圆度
C. 椭圆度、锥度
D. 锥度、圆柱度

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学习资料：

[单选题]活塞运动部件与固定件相互位置校中是为了（）。

A. 保证校中精度
B. 提高校中精度
C. 实现校中技术要求
D. 柴油机可靠运转

[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]赛龙艉轴承材料的性能优于（）和（）。

A. 白合金/尼龙
B. 铁梨木/尼龙
C. 尼龙/橡胶
D. 白合金/铁梨木

[单选题]Charging is the filling of the engine cylinder with a supply of （） for compression.

A. water
B. fresh air
C. fuel oil
D. ga

[单选题]In a four-stroke engines the camshaft rotates at （）.

A. half the engine rotational speed
B. twice the engine rotational speed
C. the engine rotational speed
D. four times the engine rotational speed

[单选题]On opposite ends of a single shaft of a turboblower are a gas driven （）and a air compressor, which are sealed each other.

A. charge air receiver
B. scavenging air belt
C. turbine
D. air cooler

[单选题]With the shell and cap assembled as for running, a check must be made that the clearance between the cap and the housing （）.

A. has a nip
B. is large enough
C. is zero
D. are suitable

[单选题]A magnetic strainer is used in the diesel engine reduction gear oil system to remove small particles of（）.

A. water
B. babbitt
C. iron or steel
D. acid

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