The first question was quite difficult b

As a teacher, it's important that the kids take you ____. [ ]

A. entirely

B. seriously

C. heavily

D. strongly

一般胎儿到怀孕多少周后发育成熟，进行分娩？ [ ]

A．30周

B．35周

C．40周

D．45周

干管定线时其延伸方向应和二级泵站输水到水池、水塔、大用户的水流方向一致，以最近的距离，将一条或几条干管平行地布置在用水量较大的街区。平行的干管间距约为（）m。

A、100～300

B、300～500

C、500～800

D、800～1000

慢性胃炎(chronicgastritis)

茶树叶面积指数