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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单项选择题

A.improper adjustments
B.contaminated fuel
C.coated fuel lines
D.excessive vibration

单项选择题

A.during low loads
B.after proper oil viscosity is reached
C.during starting
D.after cleaning filters

单项选择题

A.adjusts the idle speed control
B.drain and flushes the governor and replace the oil
C.adjusts the compensating needle valve