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單項(xiàng)選擇題

The shape of a cam on a diesel engine determines the valve’s （）

A.point of opening
B.speed of opening
C.lift from its seat
D.all of the above

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單項(xiàng)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

單項(xiàng)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