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
50. The lazy boy got up very late and went to school in a hurry. When he arrived at school, he found that he had put his socks on _______.
A．outside
B．inside out
C．side out
D．back out
一般留置导尿管3～4天后，细菌尿的发生率达（）
A.50％
B.60％
C.70％
D.80％
E.90％以上
