单项选择题
A.has kept pace with
B.has kept pace to
C.has made pace with
D.has made pace to
单项选择题 （）the compression ratio, （） the proportion of the heat energy of the combustion turned into useful work at the crankshaft, other things being equal.
单项选择题 （） the cylinder walls, the heat passes through them by conduction.
单项选择题 The hot expanding gas rotates the blades of the exhaust turbine, thus （） a large of its power, （） drives the compressor.