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全部科目 > 水路交通运输技能考试 > 海船船员考试 > 船舶管理(轮机专业) > 轮机英语 > 船舶动力装置

单项选择题

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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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?

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单项选择题
The external circumference of a pair of main bearing shells is slightly （） that of the bore of the housing which receives them Whats the meaning of “that” in the sentence above？

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B.lighter than
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