功率因数低，说明电路用于交变磁场转换的无功功率大，从而降低了设备的利用率，增加了线路供电损失。
参考答案：对
情景交际。
1. Thank you very much.[ ]
A. You're welcome.
B. Thanks.
C. That's OK.
2. Here is an apple for you.[ ]
A. Yes, please.
B. No, I don't like it.
C. Thank you.
3. Would you like some dumplings?[ ]
A. Yes, thank.
B. No, thanks.
C. Sure.
4. Happy birthday to you![ ]
A. The same to you.
B. Yes, I am.
5. What do you want to do?[ ]
A. I'm OK.
B. Play basketball.
C. Hamburger.
承担中医药专家学术经验和技术专长继承工作的指导老师，必须从事中医药专业工作年以上，并担任高级专业技术职务年以上（）
A.30，10
B.30，20
C.40，10
D.40，20
E.30，30
