单项选择题
The ports are drilled in the liners at an angle of approx 20℃ the result being that （） is given a rotary movement.
A.the scavenging air
B.the exhaust gases
C.the mixed air
D.the spray oil
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A.pinion arrangement
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单项选择题
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A.crankshaft
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单项选择题
The pistons are cooled by oil supplied from the forced （） system.
A.fresh water
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