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【单选题】
如 图,平行板电容器经开关 K与电池连接,a处有一带电量非常小的点电荷。K是闭合的,U a 表示 a点的电势,F表示点电荷受到的电场力。现将电容器的B板向下稍微移动,使两板间的距离增大,则( )A.
U a 变大， F变大
B.
U a 变大，F变小
C.
U a 不变，F不变
D.
U a 不变，F变小
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【单选题】The question of whether war is inevitable is one which has concerned many of the world's great writers, Before considering this question, it will be useful to introduce some related concepts. Conflict...
A.
argue for the similarities between animal societies and human societies
B.
smooth out the conflicts in human societies
C.
distinguish between two kinds of opposition
D.
summarize the characteristic features of opposition and cooperation
【单选题】The question of whether war is inevitable is one which has concerned many of the world's great writers. Before considering the question, it will be useful to introduce some related concepts. Conflict,...
A.
War.
B.
Conflict.
C.
Competition.
D.
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