单项选择题
The diesel engine is a type of （）.
A.turbine engine
B.gas turbine
C.steam engine
D.internal combustion engine
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A.a micrometer
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The diameter of the gravity disc is too big It causes oil to flow through the water outlet We changed the disc and no （） is found in the water outlet.
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单项选择题
The diameter of the crank-pins should be measured with a （）.
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