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單項選擇題

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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單項選擇題

The main source of fuel injection system malfunctions is （）

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

單項選擇題

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
D.after cleaning filters

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