单项选择题

筘幅决定了织物的门幅。
A、正确
B、错误

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单项选择题

It advises artists to ________ from smoking or eating while painting, to use face masks and to provide adequate ventilation (通风) by means of an extractor fan.

A．stay
B．refuse
C．reject
D．refrain

不定项选择

‌方便抽样的结果有助于相关关系的建立。‎

A．正确
B．错误