钩尾框框身以外厚度磨耗大于（）时纵向堆焊后磨平。
A.1mm
B.2mm
C.3mm
参考答案：C
The text is very easy for you. There are ___________ new words in it. [ ]
A. a few
B. a little
C. few
D. little
如何应急处置光气泄漏？
