_ the compression ratio, _ the proportion of the heat energy of the combustion tur

_____ the compression ratio, _____ the proportion of the heat energy of the combustion turned into useful work at the crankshaft, other things being equal.

A.The high / the large

B.The higher / the larger

C.The lower/the larger

D.The low / the large

请帮忙给出正确答案和分析，谢谢！

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