正确答案: D

the exhaust valve

题目：In each cylinder cover is a large central opening for mounting （）

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学习资料的答案和解析：

[单选题]字头销外圆表面的过度磨损常采用（）工艺修复。

镀铬

[单选题]轴系校中计算中的热态是指（）。

计及轴承温度的影响

[单选题]The hand steering is a method by which the motion of the rudder is controlled with （）.

a hand-driven steering wheel

[单选题]The lowest ring of a piston is （）.

an oil distributor ring

[单选题]For a given size engine, the two-stroke/cycle diesel engine will deliver more power than a four-stroke/cycle diesel engine because （）.

it develops twice as many power strokes at the same speed