难产损伤引起的尿瘘手术修补时间应为:()
A.立即修补
B.3~6个月后修补
C.1~3个月后修补
D.6~12个月时修补
E.12个月以后修补
参考答案:B
I hope _____on time.
A.her to come
B.she can come
C.she can comes
D.her comes
细菌是遗传工程的好材料,主要是因为细菌繁殖速度很快,在适宜条件下,分裂一次只需[ ]
A.2min~3min
B.2h~3h
C.20 min~30min
D.2d~3d