血浆、血清等生物制品适宜用的干燥方法是（）
A.喷雾干燥
B.冷冻干燥
C.鼓式干燥
D.微波干燥
E.沸腾干燥
参考答案：B
— Have you finished your composition already?
— Yes. I ______ it in twenty minutes.
A．have finished
B．finished
C．will finish
D．had finished
导热率
