单项选择题

2.MRP系统中零部件需求的时间关系为:下层的订货时间=上层的需求时间。
A、正确
B、错误

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Man: I can't stand action movies. They are so loud and meaningless.Woman:______.A.I like documentaries, insteaD.B.Well, they certainly offer you a good laugh.C.When did you see it?D.Do you go to action movies often?
A.A.I
B.
B.Well,
C.
C.When
D.Do
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If we continue to destroy the countryside, more animals will become______.A.distinctB.distinguishedC.endangeredD.extinct
A.A.distinct
B.distinguished
C.endangered
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