问答题

建设工程监理招标过程中，招标人与中标人签订工程监理合同的时间是（　）
A、自发出中标通知书之日起30日
B、自发出中标通知书之日起15日
C、自确定中标人之日起30日
D、自确定中标人之日起15日

答案：1.答：在监理中标通知书发出后第45天签订监理合同不妥，依照招投标法，应于30天内签订合同。在签订委托监理合同后双方又...

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单项选择题
Which of the underline expressions is the hedging of the following sentences.There is no difficulty in explaining how a structure such as an eye or a feather contributes to survival and reproduction; the difficulty is in thinking of a series of steps by which it could have arisen.
A、There is no difficulty in explaining how a structure such as an eye or a feather contributes to survival and reproduction; the difficulty is in thinking of a series of steps by which it could have arisen.
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D、There is no difficulty in explaining how a structure such as an eye or a feather contributes to survival and reproduction; the difficulty is in thinking of a series of steps by which it could have arisen.
判断题
H桥直流变换器可以实现四象限运行。( )
答案：正确
单项选择题
间接碘量法中，加入KI的作用是 A.
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单项选择题
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A、正确
B、错误