一带电油滴在匀强电场E中从a到b的运动轨迹如图中虚线所示,电场方向竖直向下,不计

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问题:

一带电油滴在匀强电场E中从a到b的运动轨迹如图中虚线所示,电场方向竖直向下,不计空气阻力.此带电油滴从a运动到b的过程中,能量变化情况是(  )

A.动能减小

B.电势能增加

C.重力势能和电势能之和减小

D.动能和电势能之和增加

考点:动能定理电场线电势能
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【问题2】 下面是路由器Router1的配置命令列表,请为(6)~(10)空缺处填写合适的命令/参数,实现Router1的正确配置。 Router>enable Router# config terminal Router (config) # hostname Router1 Router1 (config) # interface ethernet 0 Router1 (config-if) # ip address (6) Router1 (config-if) # no shutdown Router1 (config-if) # (7) Router1 (config-if) # ip address (8) Router1 (config-if) # no shutdown Router1 (config-if) # exit Router1 (config) # ip routing Router1 (config) # router ospf 100 Router1 (config-router) # (9) Router1 (config-router) # (10) Router1 (config-router) # ip ospf message-digest-key 1 md 5 wg_gcz Router1 (config-router) # area 0 authentication message-digest Router1 (config-if) # end Router1 # Copy run start

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Proper arrangement of classroom space is important to encouraging interaction. Most of us have noticed how important physical setting is to efficiency and comfort in our work. College classroom space should be designed to encourage the activity of critical thinking. We may be approaching the twenty-first century, but step into almost any college classroom and you step back in time at least a hundred years. Desks are normally in straight rows, so students can clearly see the teacher but not all their classmates. The assumption behind such an arrangement is obvious. Everything of importance comes from the teacher.
With a little imagination and effort, unless desks are fixed to the floor, the teacher can correct this situation and create space that encourages interchange among students. In small or standard-size classes, chairs, desks, and tables can be arranged in a variety of ways. The primary goal should be for everyone to be able to see everyone else. Larger classes, particularly those held in lecture halls, unfortunately, allow much less flexibility.
Arrangement of the classroom should also make it easy to divide students into small groups for discussion or problem-solving exercises. Small classes with movable desks and tables present no problem. Even in large lecture halls, it is possible for students to turn around and form groups of four to six. Breaking a class into small groups provides more opportunities for students to interact with each other, think out loud, and see how other students’ thinking processes operate all essential elements in developing new modes of critical thinking. In courses that regularly use a small group format, students might be asked to stay in the same small groups throughout the course. A colleague of mine, John, allows students to move around during the first two weeks, until they find a group they are comfortable with. John then asks them to stay in the same seat, with the same group, from that time on. This not only creates a comfortable setting for interaction but helps him learn students’ names and faces.

The primary purpose of desk rearrangement is ______.

A. for the teacher to divide students into small groups
B. to make it possible for students to interact with each other
C. for the teacher to find out how students think
D. to give students more opportunities to practice speaking

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如果终轧(),会使钢材的晶粒粗大,影响力学性能。

A、温度过高

B、温度过低

C、以上都不是

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核对收购不良资产的档案资料应在合理的时间内完成,并及时办理交接手续,接收转让资产。

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网上商店采用的送货方式主要有()

A.快递

B.门店取货

C.邮寄

D.送货上门

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