题目内容

timing belt

A. 气门锥面
B. 气门正时
C. 正时链
D. 正时带

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更多问题

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

切削加工具有加工的适应范围广、加工精度高、表面质量好等优点

A. 对
B. 错