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【多选题】
下列说法正确的是( )。A.
迄今为止的实验发现，任何带电体的电荷量只能取“ ”的整数倍，这称为电荷的量子化。
B.
从微观上看，使物体带电的方法是使物体得到或失去电子。因此，物体要么带正电（失去电子），要么带负电（得到电子）。
C.
在一个孤立系统中，无论系统中各物体之间如何迁移电荷，系统的总电荷保持不变。这就是电荷守恒定律。
D.
库仑定律描述了真空中两个静止点电荷之间的相互作用力（库仑力），数学表达式中比例常数 ，计算中一般取 ， ，后者称为真空的电容率或介电常数。
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举一反三
【单选题】What did the boy say about his early use of the languages?
A.
He would choose properly which language to use.
B.
He bad to use English most of the lime.
C.
His parents wanted him to use his native tongue.
D.
Somebody told him what lie should do about it.
【单选题】What did the woman say about the loss of the bags?
A.
She would check with the bellboy again.
B.
She had dealt with similar cases before.
C.
The case must be reported to the guards.
D.
She would see to the matter personally.
【单选题】What did the boy say about his early use of the languages?
A.
He would choose properly which language to use.
B.
He had to use English most of the time.
C.
His parents wanted him to use his native tongue.
D.
Somebody told him what he should do about it.
【简答题】泪道包括 、 、 和 。
【简答题】泪道包括 、 、 和 ,后者通过鼻腔,开口于 。
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