A.suction
B.compression
C.expansion
D.exhaust
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A.in order to
B.because of
C.so that
D.so as to
A.play a great part on
B.run a role in
C.plays an important part in
D.acts as important part at
A.an oil seal
B.removing heat
C.a gas seal
D.cooling the piston
A.ignition ratio
B.power ratio
C.compression ratio
D.injection ratio
A.nip
B.nap
C.gap
D.lip
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Combustion knock can occur in the cylinders of a diesel engine under any condition permitting （）.
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