— How do you like the regulations of our school?
— The regulations are strict with the students and they require that students _______ at least 90% of the lectures.
A:will attend
B:will take part in
C:should attend
D:should take part in
第一个在实验中发现电流周围存在磁场的科学家是 ____.托里拆利实验首先测定了 ____的值
“开元初,四方丰稔,城镇商铺林立,客商如云。丁壮之夫,不识兵器。”这段史料可以用于研究下列哪一位皇帝在位时期的社会经济状况( )
诗歌“忆昔开元全盛日,小邑犹藏万家室”描写的历史背景是( )
对于常数m、n,“mn>0”是“方程mx2+ny2=1的曲线是椭圆”的( )