关于力和物体运动的关系,下列说法中正确的是( ) A.物体受到的合外力越大,则速

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问题:

关于力和物体运动的关系,下列说法中正确的是(  )

A.物体受到的合外力越大,则速度的改变量就越大

B.物体受到的合外力不为零且不变,则物体的运动状态一定改变

C.物体受到的合外力不为零且改变,则物体的速度一定改变

D.物体受到的合外力为零,则物体的运动状态一定不改变

考点:实验:探究加速度与力、质量的关系
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资金时间价值通常被认为是没有风险和没有通货膨胀条件下的()

A.额外收益

B.利润率

C.利息率

D.社会平均资金利润率

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关于电场和磁场,下列说法中不正确的是(  )

A.电场对放入其中的电荷有力的作用

B.磁场对放入其中的通电导线(与磁感线不平行)有力的作用

C.电场和磁场都是客观存在的物质

D.用来描述电场和磁场的电场线和磁感线是客观存在的

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流行病学研究方法的核心思想是().

A.预防为主的思想

B.研究对象为人群

C.对比的思想

D.社会医学观念

E.生态学思想

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Teachers need to be aware of the emotional, intellectual, and physical changes that young adults experience. And they also need to give serious (51) to how they can be best accommodate such changes. Growing bodies need movement and (52) , but not just in ways that emphasize competition. Because they are adjusting to their new bodies and a whole host of new intellectual and emotional challenges, teenagers are especially self-conscious and need the (53) that comes from achieving success and knowing that their accomplishments are admired by others. However, the typical teenage lifestyle is already filled with so much competition that it would be (54) to plan activities in which there are more winners than losers, for example, publishing newsletters with many student-written book reviews, (55) student artwork, and sponsoring book discussion clubs. A variety of small clubs can provide multiple opportunities for leadership, as well as for practice in successful (56) dynamics. Making friends is extremely important to teenagers, and many shy students need the (57) of some kind of organization with a supportive adult (58) visible in the background.

In these activities, it is important to remember that the young teens have (59) attention spans. A variety of activities should be organized (60) participants can remain active as long as they want and then go on to something else without feeling guilty and without letting the other participants down.

57().

A.consent 

B.insurance 

C.admission 

D.security

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在教育史上,首位倡导教学论的教育家是()

A.泰勒

B.斯腾豪斯

C.拉特克

D.夸美纽斯

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