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单项选择题
A.bottle
B.injector
C.piston
D.barrel
单项选择题
A.a separate motor
B.a cam
C.a generator
D.a chain
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