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单项选择题
A.has begun
B.takes place
C.occurs
D.happens
单项选择题
A.the cylinder head
B.the cross-head
C.the moving piston
D.the stationary piston
单项选择题
A.tank table
B.trim
C.water contents
D.oil pressure
单项选择题
A.alternator
B.turbo-charger
C.remote controller
D.windlass
单项选择题
A.suction
B.compression
C.expansion
D.exhaust
单项选择题
A.in order to
B.because of
C.so that
D.so as to
单项选择题
A.play a great part on
B.run a role in
C.plays an important part in
D.acts as important part at
单项选择题
A.an oil seal
B.removing heat
C.a gas seal
D.cooling the piston
单项选择题
A.ignition ratio
B.power ratio
C.compression ratio
D.injection ratio