电气设备的隔爆外壳失去了耐爆或爆性称()。
A.防爆
B.隔爆
C.失爆
参考答案:C
When Tony came to himself, he found himself to a big pole in a dark house.
A.tying
B.tie
C.tied
D. to be tied
选取区域A1:B5并单击工具栏上“复制”按钮,然后单击C3单元,粘贴,则区域()。
A.单元格C3
B.区域C3:C7
C.区域C3:D7
D.区域C3:D3