单项选择题

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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单项选择题

A.Steel brush
B.Fine emery cloth or steel wool
C.A section of the removed compression ring
D.A case hardened scraper

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