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【简答题】
根据短文内容,从短文后的选项中选出能填入空白处的最佳选项,选项中有两多余选项. 小题1: You probably think you will never be a top student. This is not necessarily so, however. Anyone can become a better scholar if he or she wants to. Here's how : Plan your time carefully. When planning your work, you should make a list of things that you have to do. After making the list, you should make a schedule of your time. First your time for eating, sleeping, dressing, etc. Then decide on a good, regular time for studying. 小题2: A weekly schedule may not solve all your problems, but it will force you to realize what is happening to your time. Find a good place to study. Look around the house for a good study area. Keep this space , which may be a desk or simply a corner of your room, free of everything but study materials. No games, radios, or television! When you sit down to work, concentrate on the subject! Make good use of your time in class. 小题3: . Listening carefully in class means less work later. Taking notes will help you remember what the teacher says. Study regularly. When you get home from class, go over your notes. Review the important points that your teacher is going to discuss the next day, read that material. 小题4: If you do these things regularly, the material will become more meaningful, and you will remember it longer. Develop a good attitude about tests. The purpose of a test is to show what you have learned about a subject. They help make your new knowledge. The world won’t end if you don’t pass a test, so don’t be over worried. 小题5: You will probably discover many others after you have tried these. There are other methods that might help you with your study. Don’t forget to set aside enough time for entertainment Take advantage of class time to listen to everything the teacher says. No one can become a top student unless he or she works hard. Maybe you are an average student. Make full use of class time to take notes of what the teacher says in class. This will help you understand the next class.
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【单选题】有关静电场中电场线的特点,以下说法中 不 正确的是( )
A.
电场线不闭合,总是由正电荷出发终止于负电荷
B.
电场线 不 可以相交
C.
电场线的疏密表示电场强度的大小,电场线上每点的切线方向表示该点场强方向
D.
电场线是电荷在空间产生的一种物质,客观存在,能形象地描述电场
【多选题】电场线是静电场中的一个基本概念,以下关于电场线说法正确的是( )
A.
电场线是客观存在的
B.
电场线是人类假想的
C.
电场线越密,电场越小
D.
电场线越密,电场越大
【单选题】在静电场中,有关电场线的下列说法中,正确的是( )
A.
初速度为零的点电荷,在电场中只受电场力作用,则它的运动轨迹可能与电场线重合
B.
电场线通过的地方有电场,电场线不通过的地方没有电场
C.
点电荷在电场中所受的电场力方向可能与电场线垂直
D.
电场线的分布可以用实验来模拟,表明在电场中确实存在电场线
【简答题】火车在铁路上运行属于(    )现象。
【单选题】关于静电场的电场强度, 以下说法中正确的是[ ]
A.
电场中某点电场强度的方向, 就是将点电荷放在该点所受电场力的方向;
B.
在以点电荷为中心的球面上, 由该点电荷所产生的电场强度处处相同;
C.
电场强度方向可由 定出, 其中q可正, 可负;
D.
以上说法全不正确。
【单选题】在静电场中,以下说法正确的是:
A.
电场强度为零的地方,电势也一定为零;
B.
电势为零的地方,场强也一定为零
C.
电势的零参考位置不能任意选取,只能选择在无穷远处;
D.
带正电的物体,电势可能是负的
【单选题】反映总体内部构成状况的指标是
A.
动态相对指标
B.
比较相对指标
C.
结构相对指标
D.
强度相对指标
【单选题】把导体和电介质分别放进静电场中,以下说法正确的是( )
A.
导体表面和电介质表面都会产生束缚电荷
B.
体内部和电介质内部的场强都是零
C.
无论导体还是电介质都会达到静电平衡
D.
导体在静电场中会发生静电感应,电介质在静电场中会被极化
【判断题】隋朝灭亡后,中国又出现了“五代十国”分裂割据的局面。
A.
正确
B.
错误
【多选题】机油按照基础油的质量可以分为哪几种?
A.
全合成机油
B.
半合成机油
C.
矿物机油
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