正确答案: A

A．0.4R

题目：螺旋桨桨叶面上的A区是指（）以内的区域。

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学习资料的答案和解析：

[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。

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 （）.

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.

imposing

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

the indicator cock