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【多选题】
关于施工缝的留设，下列说法正确的是( )。A.
施工缝是结构中的薄弱环节，在结构剪力较小的部位
B.
柱子应留设水平缝，梁、板、墙应留设垂直缝
C.
柱宜留置在基础顶面、吊车腿下面、吊车梁上面或无梁楼盖柱帽下面和板整体的大截面梁应留在楼板底面以下10～30mm处
D.
有主次的梁的肋梁楼板宜顺着次梁方向浇筑，施工缝应留在次梁跨度中间的1/3范围内，楼梯应留在梯段长度中间的1/3范围内
E.
栏板与踏步板一起浇筑，所以施工缝位置应与楼梯施工缝对应
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皮皮学刷刷变学霸
举一反三
【单选题】以下描述正确的是
A.
回归分析主要是了解自变量与因变量之前的数量关系，主要用于寻找两个或两个以上的变量之间相互变化的关系；
B.
聚类分析用于发现大量数据中变量间的关联性。随着不停地收集和存储大量数据，从大量商业交易的记录中发现有趣的关联关系
C.
聚类分析通过一批已知的训练数据建立一棵决策树，然后利用建好的决策树，对数据进行预测。决策树的建立过程可以看成是数据规则的生成过程。
D.
以上都对
【多选题】下列哪些性质与卡托普利相符（）
A.
化学结构中含有两个手性碳原子
B.
为血管紧张素转化酶抑制剂
C.
为抗心律失常药
D.
结构中含有巯基，有还原性，遇光在水溶液中会发生自动氧化，生成二硫化合物
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【单选题】The purpose of the author to write this article probably is______.
A.
to criticize the inconvenience brought with by Excite Inbox.
B.
to monopolize the production and sale of Microsoft outlook or Palm Desktop.
C.
to introduce the services offered by Excite Home's Excite Inbox.
D.
all of the above.
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