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。( )
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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
Which CANNOT replace the brackets in this sentence? "May Day (also Labor Day or Workers' Day) is celebrated on May 1."
A. commas
B. dashes
C. colons