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(每题的备选项中，只有1个最符合题意) 某一级施工企业近来连续承建了甲房地产开发商开发的住宅小区砖混结构6层住宅楼3幢(砖基础采用条形基础)，乙公司高档写字楼26层框架剪力墙结构1幢(基础采用了地下连续墙工艺)，抗震设防烈度为7度，总建筑面积32880m2。 砌筑普通黏土砖墙时，如留斜槎，斜槎长度一般不应小于高度的( )。
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(每题的备选项中，有2个或2个以上符合题意，至少有1个错项。) A市一公共建筑工程，建筑面积19278m2，框架结构，地上6层，地下1层。由甲建筑公司施工总承包，2006年8月10日开工，2007年10月30日竣工。施工中发生如下事件。 事件一：地下室外壁防水混凝土施工缝有多处出现渗漏水。 事件二：屋面卷材防水层多处起鼓。 导致事件一的原因有( )。
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