氩弧焊产生的紫外线是手弧焊的（）倍
A、2～8
B、4～10
C、5～30
参考答案：C
Excuse me. I _________ I was blocking(挡) your way.
A．didn't realize
B．don't realize
C．haven't realized
D．wasn't realizing
又聋又哑的人或者盲人违反治安管理的，不予处罚。 ( )
