A:finishing; did he go
B:he finishes; did he go
C:he finished; he went
D:having finished; he went
Nicotine is a drug(药) that gets one into the __________ of smoking.
下图为神经元动作电位的示意图,下列有关分析正确的是( )
用坐标法证明:等腰三角形ABC底边上一点到两腰的距离和等于一腰上的高.