所有流体由液态变气态必定（）
A.放热
B.吸热
C.不吸也不放热量
D.不一定
参考答案：B
The advocates—mainly family therapy doctors—are applying a new approach to everything from marriage conflict to psychosis.
A．margin
B．marine
C．marital
D．martial
A．5A
B．5A
C．3.5A
D．3.5A
