题目内容

camshaft

A. 曲柄
B. 凸轮轴
C. 曲轴
D. 连杆

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timing belt

A. 气门锥面
B. 气门正时
C. 正时链
D. 正时带

valve spring

A. 气门锥面
B. 气门座
C. 气门弹簧
D. 进气门

Timing belt is made from rubber . It is

A. low in noise
B. small in resistance
C. cheap in cost
D. and easy in replacement

An engine valve is made up of ()

A. a valve head
B. a valve stem
C. a valve spring
D. a valve face