含烃类设备法兰泄漏处理时应使用（）。
A、铁质工具
B、铜质工具
C、不锈钢工具
D、无所谓
参考答案：B
—What shall we do tonight then?
—________—whatever you want.(2012·全国Ⅱ)
A．Help yourself
B．It's a deal
C．No problem
D．It's up to you
Mr. Wood is writing on the blackboard the chalk.[ ]
A. with
B. in
C. for
