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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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The main source of fuel injection system malfunctions is （）

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

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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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