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问题 单项选择题

一汽车在路面情况相同的公路上直线行驶，下面关于车速、惯性、质量和滑行路程的讨论正确的是（）

A.质量越大，它的惯性越大

B.车速越大，它的惯性越大

C.车速越大，刹车后滑行的路程不一定越长

D.刹车后滑行的路程越长，惯性越大

答案

参考答案：A

解析：质量是衡量惯性大小的唯一因素，质量越大，惯性越大，惯性与物体的运动性质无关，只与物体的质量大小有关，A正确，BD错误；汽车刹车问题过程中末速度为零，根据可逆性可得可得车速越大，滑行距离越大，C错误

单项选择题

The first and most important agents of socialization are the people who care for infants. In the earliest months, messages from nurturers constitute the child’s basic understanding of the world around it. This is the infant’s first introduction to the language that shapes perception and elicits emotion.
Another powerful source of information and socialization is the friendship of peers. Peers are equals that one can deal with on the same level as oneself, whereas parents are superiors. The heavy emotional overlay of family relationships makes some kinds of learning difficult.
Much formal socialization is placed in the hands of professionals. Teachers from kindergarten on are specifically designated agents of socialization. Ideally, a teacher is one who has both knowledge and the skills to present it. During the course of teaching their subjects, classroom instructors provide role models and attempt to convey the excitement of learning itself.
In earlier times, parents, friends and teachers would comprise the list of primary childhood socializers. Children’s books, comics and magazines might also have been mentioned as sources of information on norms and role models. Today one must add three powerful indirect or non-personal socialization agents: radio, movies and television. Many people learn about politics, form a vision of well-being, and develop attitudes towards others from what they see on the screen and hear through the speakers.

Which of the following statements is NOT true

A．Language shapes an infant’s perception.

B．Language elicits an infant’s emotions.

C．Language forms an infant’s cultural awareness.

D．Language forms an infant’s basic understandin
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单项选择题

通过一辆轮椅的检票口、结算口通道净宽不应小于（）m。

A.0.8

B.0.9

C.1.0

D.1.2
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