單項(xiàng)選擇題

When fuel is injected late into a diesel engine cylinder,（）.

A.the exhaust will be clear
B.fuel consumption will be low
C.all the fuel will be burned at top dead center
D.fuel consumption will be high

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單項(xiàng)選擇題

In a diesel engine, when installing new piston rings it is important to check（）
Ⅰ.ring gap clearance
Ⅱ.side clearance

A.Ⅰ only
B.Ⅱ only
C.both Ⅰ and Ⅱ
D.neither Ⅰnor Ⅱ

單項(xiàng)選擇題

At bottom dead center, the centerline of the connecting rod usually coincides with the（）

A.angularity of the piston motion
B.inertia moment from the piston
C.centerline of the cylinder
D.centerline of the king pin