什么叫产褥感染？
参考答案：产褥感染是指分娩时及产褥期生殖道受病原体感染，引起局部和全身的炎性变化。是孕产妇死亡的主要原因之一。
M: Prof. Smith asked me to go to his office after class. So it is impossible for me to make it to the bar at 10:00.W: Then it seems we’ll have to meet an hour later at the library.Q: What will the man do first after class().
A. Go to the library.
B. Meet the woman.
C. See Professor Smith.
D. Have a drink in the bar.
S0LAS公约规定，发给短途航行舰舶的证书未按照规定展期的，其有效期至多给予（）的宽限期。
A.一个航次
B.3个月
C.5个月
D.一个月
