Which statements can be used when visiting a wine manufacturer?
A. We are interest in learing about your pack-aging process.
B. It was very kind of you to give me a tour of the plant.
C. We look foward to hear from you soon.
D. Let me give you a list of departments first.
查看答案
—— What's your usual percentage of rejects?—— _____________________ .
A. We put it on the market just two monthes ago.
B. One thousand uint per month now.
C. About 2% in normal operations.
D. No one can match us as far as the speed is concerned.
下列属于β-内酰胺类药物的性质的是（）。
A. 水溶性
B. 旋光性
C. 不稳定性
D. 水解性
E. 以上都是
下列属于β-内酰胺类药物的是（）。
A. 阿莫西林
B. 头孢氨苄
C. 青霉素G
D. 红霉素
E. 庆大霉素
以下属于内酰胺类抗生素的有（）。
A. 氨苄西林
B. 阿莫西林
C. 阿奇霉素
D. 头孢拉定
E. 多西环素
微信支付 
支付宝支付