单项选择题
The three basic parts of any eductor are the nozzle, the suction chamber, and the （）.
A.injector
B.compressor
C.diffuser
D.siphon
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单项选择题
（）, the engine must be stopped immediately.
A.Should knocking occur
B.If knocking occur
C.Should if knocking occurs
D.If occur knocking -
单项选择题
Grind the （）.
A.keyway
B.shaft
C.packing
D.valve -
单项选择题
Which of the following can be obtained by means of an indicator card?（）
A.the peak pressure in a cylinder
B.the temperature of the cooling water
C.the fuel consumption
D.none of the above
