如循环的目的是将热能持续的转化为机械能，则该循环是（）
A、制冷循环
B、热机循环
C、逆循环
D、热泵循环
参考答案：B
Not only late, he also forgot his book.
A．had he turned up
B．he had turned up
C．he turned up
D．did he turn up
下列腧穴，不属于足少阳胆经的是（）
A.风池
B.风市
C.风府
D.头临泣
E.足临泣
