流体在水平管内作稳定连续流动时，当流经直径小处，流速会增大（ ）
查看答案
Project Hope is a(n)________ that raises money to build schools and buy books for children in poor areas.
A. community
B. club
C. organization
D. union
There is no hospital in the ______area.
A. recent
B. temporary
C. immediate
D. academic
The answer depends on what kind of system is ______ adopted.
A. ultimately
B. lively
C. seriously
D. comparably
I have a lot of ______ activities,I'm on the school football team.
A. extracurricular
B. historical
C. academic
D. psychological
微信支付 
支付宝支付