---I have tried very hard to find a way out of the trouble, but failed.

---why not ask Frank for help? You see______________.

A．No pains, no gains

B．It’s better to think twice before doing something

C．Two heads are better than one

D．A friend in need is a friend indeed

依据华电集团《电力安全工作规程》（热力和机械部分）规定不准在什么环境中使用能够产生火花的电气工具和用具？