螺旋桨桨叶面上的A区是指（）以内的区域。

【名词&注释】

导热性(thermal conductivity)、螺旋桨桨叶(propeller blades)

[单选题]螺旋桨桨叶面上的A区是指（）以内的区域。

A. A．0.4R
B. B．0.5R
C. C．0.6R
D. D．0.7R

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学习资料：

[单选题]赛龙艉轴承材料具有弹性好、（）和不会剥落的特点，但导热性差和不耐高温。

A. 强度高、硬度高
B. 强度高、韧性好
C. 硬度高、耐磨
D. 耐磨、耐蚀

[单选题]In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a drilled passage in the crankshaft to the bottom end bearing and then up a connection rod to the （）.

A. crosshead
B. crankpin
C. crank journal
D. gudgeon pi

[单选题]When a crankshaft has to be handled outside the engine, it should be carefully supported in a manner which will avoid （） high bending moments on it.

A. compressing
B. interposing
C. imposing
D. pounding

[单选题]Whilst the engine is turning, check to see that no water is leaking into the crankcase, scavenge air belt, or from （）.

A. exhaust valves
B. starting valves
C. fuel valves
D. the indicator cock

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