化学品是指各种化学元素、由元素组成的化合物及其混合物,包括天然的或人工的。
参考答案:对
Read and choose. 给下列问句选合适的答语。
( ) 1. What time is it?
( ) 2. How's the weather today?
( ) 3.What day is the first day of the week?
( ) 4. What's the date?
( ) 5. When is Spring Festival?
A. It's September fifth.
B. It's eight o'clock.
C. Sunday.
D. It's sunny.
E. It's in January or February.
一线抗结核药为()。
A.卷曲霉素
B.卡那霉素
C.乙胺丁醇
D.利福平
E.氨硫脉