大隐静脉在汇入静脉前接受的属支有
A．股内侧浅静脉
B．股外侧浅静脉
C．旋髂浅静脉
D．腹壁浅静脉
E．腹壁下静脉
参考答案：A,B,C,D
在数轴上，点P表示的数是-1，距离P点3个单位长度的点P′所表示的数应为______．
E-mail is a(n) ______ message delivery system that allows information such as typed messages and multimedia to be sent to individual compmer users．
A．graphic-based
B．char-based
C．web-based
D．text-based
