单项选择题
再使用包装策略是指包装物在被包装的产品消费完毕后再用来包装新产品。 ( )
A.正确
B.错误
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单项选择题
营业税有稳定的税率体现了税收的()
A.强制性
B.无偿性
C.灵活性
D.固定性
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单项选择题
The 'cloak' scientists have inventedA.can keep an object invisible in three dimensions.B.can hide an object from detection only in one direction.C.is a true invisibility cloak.D.is just a minor achievement.
A.can
B.
B.can
C.
C.is
D.
D.is
E.
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