单项选择题
A.are interdependent
B.are not interdependent
C.have nothing to do with each other
D.are independent
单项选择题 The development of oils （） the increasing demands made by the steady rise in powers produced by modem diesels.
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.