【多选题】According to the speaker, what are the best descriptions of normal lectures at school?
B.
Interesting and rewarding.
【简答题】M受体兴奋可引起() A心脏兴奋 B胃肠平滑肌收缩 C膀胱逼尿肌舒张 D瞳孔扩大 E膀胱括约肌收缩
【单选题】What is the color code of the shelves where normal size novels are placed?
【单选题】根据阀瓣前后的压力差自动启闭,有严格的方向性,只许介质向一个方向流动,可阻止其逆向流动的阀门是( )。