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【单选题】
（单选）对于不可压缩流体流动的圆形直管，若管径减小为原来的1/2，则流体流速（ ）A.
不变
B.
变为原来的 2 倍
C.
变为原来的 4 倍
D.
层流时变为原来的 2 倍，湍流时变为原来的 4 倍
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反馈参考答案：
举一反三
【单选题】---is your house from school? --- It's three kilometers.
A.
How tall
B.
How long
C.
How far
D.
How old
【单选题】The school____________ I study English is not far from your house.
A.
why
B.
when
C.
where
【简答题】给下列的问句选择合适的答语。 ( ) 1. What's the name of your city? ( ) 2. Is your home far from Beijing? ( ) 3. Do you live in a house? ( ) 4. When did you come to Canada? ( ) 5. Where are you fr...
【单选题】材料相同的长管并联管道1、2,两管段直径相等,沿程阻力系数相等,长度l 1 =9l2,两管段的流量比Q 1 /Q 2 为()。
A.
1/3
B.
3
C.
1/2
D.
2
【简答题】the shopping mall, it, from your house, is, to, how far (连词成句)
【单选题】--How far is your house from here? --About ____ walk.
A.
20 minute
B.
20 minute’s
C.
20 minutes
D.
20 minutes’
【单选题】When I’ve saved up enough money, I’m going to buy / I’ll buy a digital camera.
A.
I’m going to buy
B.
I’ll buy
C.
A and B are both right.
D.
A and B are both wrong.
【单选题】–How far is the Great Bay from your house? -_____________________.
A.
Yes, the Great Bay is real beautiful.
B.
The Great Bay is five minutes away from my house and it's fantastic.
C.
Sorry, it's too long
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