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【简答题】
企业设备管理设三个主要层次:企业级--();车间级--();班组级--()。
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【单选题】听力原文：As to this agreement, no questions come to my mind right now, but I'd like to read it through again before signing it. (23)
A.
I'll ask someone else to read and check this agreement for errors.
B.
I'll think more about the agreement before making a decision.
C.
It's obvious that I'll discuss the agreement with my assistant first.
D.
It's out of question that I should get into any agreement with you.
【单选题】______ On an extremely hot day, sweating to cool your body effectively will occur when the air is very hot and dry and carries no water at all.
A.
T
B.
F
C.
NG
【多选题】Which three statements correctly describe the functions and use of constraints? （）
A.
Constraints provide data independence.
B.
Constraints make complex queries easy.
C.
Constraints enforce rules at the view level.
D.
Constraints enforce rules at the table level.
E.
Constraints prevent the deletion of a table if there are dependencies.
F.
Constraints prevent the deletion of an index if there are dependencies.
【简答题】在 S N 1 反应中,产物构型为( )
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