单项选择题

When using a fuel with a higher than normal sulfur content in an auxiliary diesel engine, you should（）

A.maintain higher than normal jacket water temperature
B.change the lube oil more frequently than normal
C.maintain a higher air-box temperature than normal
D.maintain a higher air-box pressure than normal

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单项选择题

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

单项选择题

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

单项选择题

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