单项选择题
Which of the listed devices could be used as a substitute for a ring grooving tool?（）
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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In which of the scavenging methods listed will the exhaust valve be located in the cylinder head?（）
A.Return-flow
B.Uniflow
C.Cross-flow
D.Direct flow -
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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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
