简述干燥设备的选型原则。
参考答案:
1、产品质量要求;
2、产品的纯度;
3、物料的特性;
4、产量及劳动条件。
— Hurry up!It's already 8:20.
— ________ ! It takes only 20 minutes to get to the station and the train doesn't leave until 9:20. [ ]
A. No hurry
B. No way
C. No problem
D. No chance
伤寒玫瑰疹常出现在病程的()
A.28天以后
B.21~28天
C.1~6天
D.7~13天
E.14~20天