厂商控制代理商一般在（）。
A.订立代理合同之前
B.订立代理合同之时
C.订立代理合同之后
D.交付货款之时
参考答案：A, B, C
A: If you like, I can help you paint the room tomorrow. B: ().
A. Thanks a lot. But I think I can manage it myself.
B. No. Don’t worry about that.
C. I don’t like it. Thanks anyway.
D. I’m sorry. That’s not necessary.
10kV及以下电压等级，电压允许波动和闪变限值为（）
A.0.02
B.0.025
C.0.016
D.0.01
