蒸气压缩式理论循环并未假设制冷剂在（）。
A.压缩机中是等熵过程
B.换热器中是等压过程
C.膨胀阀前后焓相等
D.冷凝器中是多温过程
参考答案：D
胎盘早期剥离的主要病理变化是
A．胎盘边缘血窦破裂
B．真蜕膜出血
C．包蜕膜出血
D．底蜕膜出血
E．胎盘血管破裂
He slipped and broke his leg. _________, he will have to be away from school for two or three months.
A．On the contrary
B．In a word
C．In a way
D．As a result
