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问题 实验题

用游标50分度的卡尺测定某圆柱的直径时，卡尺上的示数如图。可读出圆柱的直径为        mm。

答案

42.12

题目分析：游标卡尺读数先读出游标尺零刻度线左侧主尺上的毫米整数部分即42mm，然后找出游标尺上与主尺对齐的刻度线为6，乘以精确度即50分度游标卡尺精确度为0.02mm，所以最终结果为

单项选择题

不透光性肾结石的首选影像学检查方法是()

A．超声检查

B．腹部平片

C．CT扫描

D．MRI

E．IVP
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单项选择题

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.

52().

A.care 

B.nutrition 

C.exercise 

D.leisure
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