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【单选题】
在下面的假定中,不属于方差分析的假定是A.
每个总体都服从正态分布
B.
各总体的方差相等
C.
观测值是独立的
D.
各总体的方差等于0
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【单选题】People once widely believed that intelligent life existed on Mars. The 19th-century discovery of what appeared to be geometric designs cut across the surface was taken as evidence. The lines were thou...
A.
Because the surface of Mars seemed to be geometric.
B.
Because the lines were drawn across the surface of the planet.
C.
Because a system of canals was thought to be there.
D.
Because it was the Martians that built the canals.
【简答题】(第五章)微晶纤维素常作稀释、黏合和__________三合剂使用。
【多选题】混凝土结构对钢筋性能的要求（ ）
A.
钢筋的屈服强度、极限强度和强屈比等要符合规范要求。
B.
钢筋要有一定的塑性，伸长率和冷弯性要合格。
C.
钢筋要有良好的 可焊性 。
D.
为了保证钢筋与混凝土的粘结力，必须用变形钢筋。
E.
钢筋的疲劳强度和疲劳应力幅值要满足要求。
【简答题】阅读理解。 A woman whose sports car was stolen with her dog in it put up notices all over the area that made it clear getting back her pet was more important than her car. 'Whoever did this can keep my car...
【简答题】混凝土结构用钢筋应检验哪些力学性能指标?混凝土结构对钢筋性能有哪些基本要求?我国《规范》对混凝土结构钢筋的选用有哪些要求
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