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單項(xiàng)選擇題

The figure that the volume of air at BDC is divided by the volume of air at TDC is termed as（）.

A.ignition ratio
B.power ratio
C.compression ratio
D.injection ratio

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單項(xiàng)選擇題

The external circumference of a pair of main bearing shells is slightly larger than that of the bore of the housing which receives themThe difference is termed （）.

A.nip
B.nap
C.gap
D.lip

單項(xiàng)選擇題

The external circumference of a pair of main bearing shells is slightly （） that of the bore of the housing which receives themWhat’s the meaning of “that” in the sentence above?

A.less than
B.lighter than
C.larger than
D.smaller than