电伤指电流的热效应、化学效应或机械效应对人体的伤害
正确
暂无解析
Ourcountryisnolongerwhatit_____.
TheGreatWallinChinaisoneofthefew_____objectsontheearth_____fromthemoon.
I__________themovie,butnowIhardlyrememberit.Canyouremindmeofitsname?
设A为5阶方阵，且r(A)=3，则线性空间W={x|Ax=0}的维数是______________.
Atthismomentthebellrang,________theendofclass.