单项选择题
Which of the fuel injection systems listed uses a spring loaded differential spray needle valve and individual pump for each cylinder?（）
A.Common-rail injection
B.Air injection
C.Jerk pump injection
D.Distribution injection
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相关考题
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单项选择题
The mode of control employed by an alarm circuit is a （）
A.two position control
B.signal speed floating control
C.proportional speed floating control
D.reset control -
单项选择题
The meat box temperature control circuit, as used in ship service refrigeration system, is an example of （）
A.two position control
B.signal speed floating control
C.proportional control
D.reset control -
单项选择题
The two most common gases used in pneumatic system are （）
A.compressed air and nitrogen
B.helium and nitrogen
C.oxygen and hydrogen
D.oxygen and acetylene
