测量曲轴臂距差还要求在（）时进行，以避免在船体变形的情况下测

【名词&注释】

环境温度(ambient temperature)、柴油机(diesel engine)、螺旋桨桨叶(propeller blades)、阴雨天(those opened)

[单选题]测量曲轴臂距差还要求在（）时进行，以避免在船体变形的情况下测量。Ⅰ.午后；Ⅱ.上午；Ⅲ.清晨；Ⅳ.夜间；Ⅴ.阴雨天^{(those opened)}。

A. Ⅰ＋Ⅲ＋Ⅳ
B. Ⅲ＋Ⅳ
C. Ⅲ＋Ⅳ＋Ⅴ
D. Ⅰ＋Ⅳ＋Ⅴ

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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]柴油机未装连杆状态下，盘车一周可测得曲轴（）个臂距值。

A. 3
B. 4
C. 5
D. 6

[单选题]新制艉轴铜套的厚度应为（）。

A. 0.02d＋5mm
B. 0.015d＋3.5mm
C. 0.03d＋7.5mm
D. 0.01d＋2mm

[单选题]螺旋桨桨叶0.4R以外的裂纹可采用（）修理。

A. 修磨
B. 波浪键扣合
C. 完善的工艺焊补
D. 粘接

[单选题]During （）, the starting air valves should be closed to prevent the engine from turning.

A. overhaul
B. running
C. blowing down
D. All of the above are correct

[单选题]In an ordinary diesel engine the fuel injection begins （）

A. after TDC
B. before TDC
C. after BDC
D. before BDC

[单选题]The indicated power of an engine can be obtained by taking the （）.

A. precautions
B. rpm
C. indicator cards
D. B and C

[单选题]When reassembling the bowl of a disk-type centrifuge, the bowl or locking ring is rotated （）.

A. clockwise, due to the bowl rotating clockwise
B. clockwise, due to the bowl rotating counterclockwise
C. counterclockwise, due to the bowl rotating clockwise
D. counterclockwise, due to the bowl rotating counterclockwise

[单选题]The power output of a turbocharged diesel engine will drop if the cooling water flow through the after-cooler is interrupted because the （）.

A. turbocharger stalls
B. exhaust pressure increases
C. air charge density decreases
D. scavenge effect increase

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