单项选择题
The conclusion that mechanical efficiency is always （） 100 percent is correct.
A.small than
B.more than
C.little than
D.less than
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单项选择题
The compressed air is supplied by （） to the air reservoirs.
A.compressors
B.forced fans
C.ventilators
D.generators -
单项选择题
The compressed air is admitted to each cylinder through a cam operated by starting air valve when the piston has just passed its （）.
A.BDC
B.TDC
C.BBDC
D.ATDC -
单项选择题
The complete assembly of bedplate, A-frames and cylinder block is held together by （） to form a rigid structure.
A.tap-bolts
B.jack-bolts
C.tie rods
D.fitted rods
