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单项选择题

多发性硬化的最常见的临床表现？ A.
视力障碍  B.
肢体无力 C.
感觉遗传 D.
共济失调

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单项选择题
下列关于预应力混凝土的论述中( )是错误的。
A.无黏结预应力采用后张法施工
B.水下环境中的结构构件应采用有黏结预应力
C.中等强度钢筋不适用作为预应力筋，是由于其有效预应力低
D.施加预应力的构件的抗裂性提高，故在使用阶段都是不开裂的
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.
Which of the following would be the best title for the passage?
A.TheChildasaUtilitarianOrganism
B.TheDevelopmentofCulturalValues
C.TheChildrenofColonialNorthAmerica
D.ThePlaceofChildreninAmericanSociety
单项选择题
变风量系统比定风量系统节能的原因（ ）。
A、根据负荷变化调节送风量
B、没有再热
C、新风比可调
D、湿度控制精准
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