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【单选题】
层流时流体在圆管内的速度分布规律为( )形式。A.
指数
B.
二次曲线（抛物线）
C.
直线
D.
不确定
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反馈参考答案：
举一反三
【单选题】— I wonder if I ______ late for class, Mr. Li?— Ben, you are late again.
A.
have been
B.
am
C.
was
【单选题】—Ben, would you like to play football with us? —______ , but I have to wash the dishes (洗盘子) first. [ ]
A.
No, I can't
B.
I don't want to
C.
Yes, please
D.
I'd love to
【单选题】- Ben, can you come to play football with us now? - ________, but I have to wash the dishes first.
A.
No, I can’t
B.
I don’t want to
C.
Yes, please.
D.
I’d love to
【单选题】— Ben, Would you like to play football with us? — , but I have to wash the dishes first [ ]
A.
No, I can't
B.
I don't want to
C.
Yes, please
D.
I'd love to
【单选题】______, as long as I’m with nature, I don’t care.
A.
However tough is the journey
B.
Whatever tough is the journey
C.
However tough the journey is
D.
Whatever tough the journey is
【单选题】He promised to pick me up at the school gate. However, he yet.
A.
hasn’t arrive
B.
didn’t arrive
C.
doesn’t arrive
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