根据题意得:2-x≠0,
解得x≠2,
故选B.
_______should not be allowed to get ears pierced.
A.Twelve-year-old
B.Twelve-year-olds
C.Twelve years old
D.Twelve years olds
隔爆电气设备电缆引入时,密封圈的厚度必须大于()㎜。
A、3
B、4
C、5
D、6