The primary purpose of the passage is to ________.
A. explain the differences in the working of a heat pump when the outdoor temperature changes
B. contrast the heating and the cooling modes of heat pumps
C. describe heat pumps, their use, and factors affecting their use
D. advocate the more widespread use of heat pumps
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It's a long lane with no turning. Hardship or difficult does not usually last
A. at last
B. at all events
C. for good
D. any way
According to the passage, the role of the flow restriction in a heat pump is to ________.
A. measure accurately the flow rate o the refrigerant mass at that point
B. compress and heat the refrigerant vapor
C. bring about the evaporation and cooling of refrigerant
D. exchange heat between the refrigerant and the air at that point
Charles would quit his job to ________ more respectable employment.
A. take up
B. take to
C. take into
D. take over
下列不合法的main函数命令行参数的表示形式是 ______ 。
A. main(int a,char * c[])；
B. main(ac,av)int arc；char * * av；
C. main(c,v)int c；char * v[]；
D. main(argc，argv)int argc；char argv[]；
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