关于电场，下列说法正确的是[ ] A．由知，若q减半，则该处电场强度变为原来的2
题型：不定项选择
问题：
关于电场，下列说法正确的是[ ]
A．由
知，若q减半，则该处电场强度变为原来的2倍
B．由
知，E与Q成正比，而与r2成反比
C．由
知，在以Q为球心，以r为半径的球面上，各处场强均相同
D．电场中某点场强方向就是该点所放电荷受到的电场力的方向
题型：不定项选择
阅读短文，判断对错，对的写“T”，错的写“F”。
John: Hello! Is that Zhang Peng?
Zhang Peng: Yes.
John: This is John. I'm going on a trip to Beijing. Can you go with me?
Zhang Peng: That's wonderful. But I need to ask my mother. When do you leave for Beijing?
John: I leave next Sunday.
( ) 1. John wants to go to Beijing.
( ) 2. John leaves for Beijing next Saturday.
( ) 3. Zhang Peng can go to Beijing with John together.
( ) 4. Zhang Peng doesn't ask his mother.