题目内容

流体流动形态用_____来判断,当_____时为瑞流,当_____时为滞流,当_____时为过渡流。

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流体在等直径的导管中作稳态流动时,由于流动有摩擦阻力损失,因此流体的流速沿管长而逐渐变小。( )

A. 对
B. 错

Which is another word for quotation mark?

A. inverted comma
B. quotation sign
C. speech mark

If a word that's too long to fit on a line is broken into two parts, the first part ends with.

A. an ellipsis mark
B. a backslash
C. a hyphen

What is the punctuation mark in they're and children's called?

A. apostrophe
B. possessive
C. super comma

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