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【简答题】
为Customer表建立约束,使customer_name列具有唯一性。
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皮皮学刷刷变学霸
举一反三
【多选题】进口环节增值税的税率,一般为17%,对关系到国计民生的重要物资征11%,适用11%税率的货品有:
A.
图书，杂志
B.
原油，成品油
C.
粮食，食用植物油
D.
D、农药，农机，农膜
【单选题】Which of the following is presented in the passages as evidence supporting the author's view of the ancient Greeks' descriptions of the Amazons?
A.
The requirement that Sauromatae women kill in battle before marrying.
B.
The failure of historians to verify that women were ever governors of ancient societies.
C.
The classing of Amazons as giants and centaurs.
D.
The well-established unreliability of Herodotus as a source of information about ancient societies.
【简答题】用水泥砂浆和水泥混合砂浆抹灰时,应待前一抹灰层凝结后方可抹后一层;用石灰砂浆抹灰时,应待前一抹灰层_______成干后方可抹后一层。
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