用一根箭线及其两端节点的编号表示一项工作的网络图称为（）
A.单代号网络图
B.双代号网络图
C.早时标网络图
D.迟时标网络图
参考答案：B
不能通过产道分娩的胎位是
A．枕左前位B．枕右后位C．颏左前位D．骶右横位E．肩左前位
His father has been trying to _____ his habit of playing video games all day. [ ]
A. cure
B. cure him
C. cure of
D. cure him of
