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【单选题】
有压管道的d与管道的水力半径R的比值是（ ）A.
8
B.
4
C.
2
D.
1
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反馈参考答案：
举一反三
【单选题】--Do you like these blue shoes? --Yes, _______.
A.
I’ll take it
B.
I’ll take them
C.
I don’t like them
D.
it’s 5 dollars
【单选题】—Would you like anything else? —____________________?
A.
I'd like to take bus.
B.
I'd like to play piano.
C.
I'd like some cookies.
【单选题】I'd like to take __________ of this opportunity to thank all of you for your co-operation.
A.
profit
B.
benefit
C.
occasion
D.
advantage
参考解析：
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