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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相关考题
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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 -
单项选择题
The main source of fuel injection system malfunctions is （）
A.improper adjustments
B.contaminated fuel
C.coated fuel lines
D.excessive vibration -
单项选择题
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
