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单项选择题

多层砌体房屋在地震中常出现交叉形裂缝，其产生原因是( )。

A.应力集中
B.受压区剪压破坏
C.抗主拉应力强度不足
D.弹塑性变形能力不足
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单项选择题
The ordinary family in colonial North America was primarily concerned with sheer physical survival and beyond that, is own economic prosperity. Thus, children were valued in terms of their productivity, and they assumed the role of producer quite early. Until they fulfilled this role, their position in the structure of the family was one of subordination ( 从属), and their psychological needs and capacities received little consideration.
As the society became more complex, the status of children in the family and in the society became more important. In the complex, technological society that the United States has become,each member must fulfill a number of personal and occupational roles and be in constant contact with a great many other members. Consequently, viewing children as potentially acceptable members of society means that they are regarded more as people in their own right than as utilitarian organisms.
This acceptance of children as equal participants in the contemporary family is reflected in the variety of statutes protecting the rights of children and in the social public welfare programs devoted exclusively to their well-being.
This new way of children and the increasing contact between the members of society has also resulted in a great interest in child-rearing techniques. People today spend a considerable portion of their time on the proper way to bring up children. It is now possible to influence the details of the socialization of another person′ s child by spreading the principle of current and fashionable theories and methods of child-rearing.
Children in colonial North America were mainly valued for their .
A.survivalability
B.physicalcharacteristics
C.productivecapacity
D.academicachievements
单项选择题
地震区单层钢筋混凝土厂房天窗架的设置，下列说法不正确的是( )。
A.天窗宜采用突出屋面较小的避风型天窗
B.突出屋面的天窗宜采用钢天窗架
C.8度抗震设防时，天窗架宜从厂房单元端部第二柱间开始设置
D.天窗屋盖、端壁板和侧板，宜采用轻型板材
单项选择题
某现浇钢筋混凝土框架结构，顶层现浇女儿墙(板)总长度60m，女儿墙高Ⅰm，分缝间距及缝宽符合规范要求的是( )。
A.@10m，30mm
B.@20m，30mm
C.@30m，50mm
D.@40m，50mm
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