题目内容

An engine is mainly composed of two mechanisms and systems.

A. one
B. two
C. three
D. five

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The intake stroke begins with the piston at the

A. BDC
B. MBC
C. TDC
D. CMP

Just before the bottom of power stroke, the exhaust valve.

A. ups
B. downs
C. closes
D. opens

Intake stoke___ Internal combustion engine Lubricating system_ Exhaust valve Cylinder block___

Drum brake___ Manual transmission_ Shock absorber__ Pitman arm Steering column_