水带破孔修补主要有（）种方法。
A、1
B、2
C、3
D、4
参考答案：C
34. —— OK, $ 500, but that is my last offer.
—— _______.
A．OK, it's a deal.
B．What did you say?
C．Oh, it's up to you.
D．Good idea!
哪些电气设备的金属外壳及架构要进行接地或接零？
34. —— OK, $ 500, but that is my last offer.
—— _______.