某曲柄的两主轴承在水平平面内位置偏左，曲轴轴线呈左拱形，则其

【名词&注释】

弯曲应力(bending stress)、剪应力(shear stress)、不一定(not always)

[单选题]某曲柄的两主轴承在水平平面内位置偏左，曲轴轴线呈左拱形，则其Δ-（）。

A. ＞0
B. ＜0
C. ＝0
D. 不一定

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学习资料：

[单选题]从液压拉伸器的结构上看，当活塞的升程超过了其“最大升程”时，会出现（）现象。

A. 活塞顶部泄放旋塞漏油
B. 活塞上部与油缸的密封处漏油
C. 活塞下部与油缸的密封处漏油
D. 活塞底部的泄油孔漏油

[单选题]The crankshaft receives and transmits the full working power of the engine and is subjected to fluctuating （）.

A. bending stresses弯曲应力
B. torsion stresses扭转应力
C. shear stresses剪应力
D. All of the above

[单选题]（） into the cylinder because no fuel can burn （） it.

A. Air must be admitted；without
B. Oil must be injected；without
C. Air must be admitted；with
D. Oil must be injected；with

[单选题]The speed of the camshaft in a two-stroke/cycle diesel engine, running at 950 RPM, is （）.

A. 475 RPM
B. 950 RPM
C. 1900 RPM
D. 2400 RPM

[单选题]Camshafts are usually driven by timing gears or （）.

A. push rods
B. chain drives
C. rocker arms
D. flywheel

[单选题]Misalignment of the drive shaft and propeller shaft flanges can be detected by using a dial indicator or （）.

A. inside micrometer
B. feeler gauge
C. adjustable trammel
D. sighting device

[单选题]A towing vessel’s capability is BEST measured by horsepower，bollard pull，maneuverability and（）.

A. displacement
B. stability
C. towrope pull
D. propeller desig

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