Their school has more than two _____ teachers and _____ students.
A:hundreds of, thousands of
B:hundred, thousands of
C:hundred of, thousand
D:hundreds, thousands of
⑴景点名称;
⑵参观内容;
⑶推荐理由。
注意:
⑴词数不少于50;
⑵开头和结尾已给出,不计入总词数。
Dear Jim,
Yours,
Li Hua
如图所示,匀强磁场垂直于矩形线框abcd,磁场的磁感应强度为B,矩形面积为S.现使矩形框以ab边为轴转动90°角,则在这个过程中,穿过线框的磁通量变化量的数值是( )
“亲子鉴定”常从血液中提取DNA,DNA主要来自于血液中的( )