改变转速是有限的,一般提高转速时,不能超过额定转速的()%。
A、5
B、10
C、15
D、20
参考答案:B
《中国药典》2005年版一部规定,广藿香药材中叶不得少于
A.3%
B.5%
C.15%
D.10%
E.20%
用单词的适当形式填空。
1. The old man has a serious ______ (ill).
2. Mr Chen is ______ (stress) out.
3. It's easy to stay ______ (health).
4. —I think our teacher is working hard. He teaches us ______ (good).
—Yes, but he hasn't come today. He doesn't feel ______ (well).
5. I don't like ______ (west) music.