题目内容

斯托克斯定律的表达式( )。

A. 6ηrυ
B. 3πηυ
C. 6πηrυ
D. 3πηrυ

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斯托克斯定律对( )适用

A. 圆形颗粒
B. 任何形状颗粒
C. 线性颗粒
D. 球形颗粒

He wanted to make sure __________.

A. how we went there by bus
B. where did we go
C. what did we go there
D. when we went there

______ the Atlantic Ocean crosses the equator（赤道）, the trade winds cause a flow of water to the west.

A. That
B. When
C. Where
D. Though

— You can't finish the book in less than an hour,I suppose?— ______

A. Yes, I'm sure I can
B. No, hardly
C. Sorry, I can't
D. I don't think I can