单项选择题
The four strokes are called suction, compression, expansion and exhaust, but only （） stroke provides the power to drive the ship.
A.suction
B.compression
C.expansion
D.exhaust
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The fine filters will be arranged （） one can be cleaned while the other is operating.
A.in order to
B.because of
C.so that
D.so as to -
单项选择题
The film of oil between the rings and the liner is not only essential for the lubrication but also （） achieving a gas seal.
A.play a great part on
B.run a role in
C.plays an important part in
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单项选择题
The film of oil between the rings and the liner is not only essential for the lubrication but also plays an important part in achieving （）.
A.an oil seal
B.removing heat
C.a gas seal
D.cooling the piston
