用电安全是保证生命财产安全的基本常识。符合安全用电的是()
A、湿手触摸电源开关
B、电线下方放风筝
C、大功率用电器同时使用
D、每个用电器一个开关
参考答案:D
I guess Tom won’t keep on asking me the time from now on as he has had his watch .
A.being repaired
B.repairing
C.to repair
D.repaired
若等式(x﹣4)2=x2﹣8x+m2成立,则m的值是[ ]
A.16
B.4
C.﹣4
D.4或﹣4