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【简答题】
配置泵送混凝土宜选用什么砂？
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皮皮学刷刷变学霸
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【单选题】若一个有向图的邻接矩阵中，主对角线以下的元素均为零，则该图的拓扑有序序列( )。【中科院计算所1998二、6(2分)】【中国科技大学1998二、6(2分)】
A.
存在
B.
不存在
【简答题】在有向图的邻接矩阵中，若主对角线以下的元素均为零，则该图的拓扑有序序列是__________的。【电子科技大学2005二、3(1分)】
【单选题】听力原文： Every couple who goes to the altar believes that they will make that trip only once in their lives. They want the day to be perfect, and they are asking for much more than good weather. Whey wan...
A.
The budgets of weddings.
B.
The business of weddings.
C.
The planning and execution of weddings.
D.
The high wedding expenses.
【简答题】绕冠状轴能做的运动是 和 ;绕矢状轴能做的运动是 和 ;绕垂直轴能做的运动是 和 。
【单选题】听力原文：The reality is that the level of distress here definitely knocked down a couple of notches today. Stocks ended slightly higher, investors paid little attention to a worse-thah-expected inflation ...
A.
The capital market could spread to other sectors of the economy.
B.
The stock market could spread to other sectors of the economy.
C.
The sub prime mortgage market could spread to other sectors of the economy.
D.
The future market could spread to other sectors of the economy.
【简答题】简述最小项具有的性质。
【简答题】真值表的最小项具有哪些性质?
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