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單項(xiàng)選擇題

The development of oils （） the increasing demands made by the steady rise in powers produced by modem diesels.

A.has kept pace with
B.has kept pace to
C.has made pace with
D.has made pace to

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單項(xiàng)選擇題

（）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

單項(xiàng)選擇題

（） the cylinder walls, the heat passes through them by conduction.

A.When receiving by
B.When received by
C.In order to receiving
D.In order to receive

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