恒稳直流电是指（）都不随时间变化的电动势。
A、大小和方向A
暂无解析
Weallthinkthat_____noneedtomakelawstopreventtheyoungfromgettingmarriedduringtheircollegelife.
______whichwaytotake,thelittleboybehavedlikearealgentlemanwhocomfortedhissisterfromtimetotime.
设A为押阶方阵，若存在数A和非零”维向量x，使得()，则称x为A相应于特征值A的特征向量.
Weneedamorecapableleader,______withstrongwillandaswellasgoodhumour.
Postage______,thenecklacewillcostyouatleast650yuan.
