在手术协议中要求病人本人或其家属签字，这是尊重病人的（）权利。
A.知情同意
B.人格尊重
C.医疗监督
D.平等医疗
参考答案：A
用所给词的适当形式填空。
1. The film is very _____ (surprise) and I'm( surprise) at it．
2. She _____ (buy) some flowers for her mother yesterday.
3. While I was _____ (shop), I saw my best friend.
4. The train usually _____ (leave) the station at ten o'clock in the morning.
5. I _____ (shop) in a supermarket when you called me up.
6. It's _____ (usual) for the trees to flower so early.
7. How about _____ (go) for a drive?
8. Listen! Someone _____ (knock) at the door.
9. What _____ you _____ (do) at 9:00 am. yesterday?
10. I _____ (wait) for the bus this time yesterday.
一个RL=5Ω的负载，经理想变压器接到信号源上，信号源的内阻R0=500Ω，变压器一次绕组的匝数N1=1000，若要通过阻抗匹配使负载得到最大功率，则变压器二次绕组的匝数N2应为（）。
A．100
B．1000
C．500
D．200
