皮皮学，免费搜题
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【简答题】
Complete the following sentence using the expressions in the following.选词填空。 convention association operation candidate supplier With the scale constantly expanding, the economic benefits have increased significantly. We're considering signing a contract with another . The 2013 will take place in Boston from 3 to 6 January 2013. She will be the obvious in 2012 if Mr.Obama goes down in defeat in November. The Naitonal Collegiate Atheletic governs colleage sports in the United States.
拍照语音搜题，微信中搜索"皮皮学"使用
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【简答题】政府采购的原则是什么？
【多选题】下列公式和参数定义正确的是( )。
A.
均值法计算公式：c=
B.
一般水质因子单项指数法:
C.
DO为溶解氧单项指数法：当DOj≥DOs， 当DOj＜DOs，
D.
pH值为单项指数法： 当pHj≤7.0，SpH,j= 当pHj＞7.0，SpH,j=