A.Steel brush
B.Fine emery cloth or steel wool
C.A section of the removed compression ring
D.A case hardened scraper
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A.Return-flow
B.Uniflow
C.Cross-flow
D.Direct flow
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
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
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
A.angularity of the piston motion
B.inertia moment from the piston
C.centerline of the cylinder
D.centerline of the king pin
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