胎盘附着部位的子宫内膜完全修复需到产后
A．3周
B．4周
C．5周
D．6周
E．8周
参考答案：D
All of them can take this job.but I want to know who is _______. [ ]
A. the most careful
B. more careful
C. careful
D. very careful
隔爆型电气设备的标志符号由（）组成。
A．Ex
B．KB
C．KY、KH
D．d
E．MA
F．I
