单项选择题
Which of the listed devices could be used as a ring groove tool during preparation for the installation of new rings?（）
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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The main source of fuel injection system malfunctions is （）
A.improper adjustments
B.contaminated fuel
C.coated fuel lines
D.excessive vibration -
单项选择题
The most crucial time for any bearing with regards to lubrication is （）
A.during low loads
B.after proper oil viscosity is reached
C.during starting
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If a main propulsion diesel engine hunts excessively at idle speed, you should （）
A.adjusts the idle speed control
B.drain and flushes the governor and replace the oil
C.adjusts the compensating needle valve
