A.keep a line from fraying
B.join lines of unequal size
C.stop off a line
D.shorten a line
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A.positive correction
B.dip error
C.negative correction
D.semidiameter error
A.Restricted area
B.Closed area
C.Prohibited place
D.Forbidden place
A.beats
B.beasts
C.bacons
D.battens
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An example of a messenger is a（）.
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