X轴上有两点电荷Q1和Q2,Q1和Q2之间连线上各点电场强度的大小如图曲线所示(

题型:选择题

问题:

X轴上有两点电荷Q1和Q2,Q1和Q2之间连线上各点电场强度的大小如图曲线所示(AP>PB),选无穷远处电势为0,从图中可以看出(  )

A.Q1电量一定小于Q2电量

B.Q1和Q2一定同种电荷

C.P点电势是零

D.Q1和Q2之间连线上各点电场方向都指向Q2

考点:电场强度的定义式电势
题型:选择题

根据短文内容及所给首字母提示写出所缺单词, 并将完整单词填在下面对应题号后的横线上。

     Hello. I'm Tom. I'm a middle school student. It's nice to meet you here. First, let me tell you (1) s______

about my family. There are (2) f______ people in my family. They are my mother, my father, my sister, my

brother and me. My father is a worker. My mother is an English teacher. My sister is eighteen and my brother

is sixteen. I'm fourteen. We three go to the (3) s______school. We all enjoy (4) w______ football games. My (5) h______ is at West Street. There is a big tree and some small trees around my house. The big one is a pear

tree and the small ones are apple (6) t______, but there (7) a______ any pears or apples on them now.

(8) H______ is a photo of my house. In the photo, you can (9) s______ three cats in my house. They are all

black and white. We (10) l______ them very much.

题型:选择题

—Would you like coffee or tea?

—Coffee, please. By the way, do you have milk? I like coffee _____ milk.[ ]

A. for

B. or

C. with

D. without

题型:选择题

小华将一个鲜鸡蛋放入装有大半杯水的玻璃杯中,鸡蛋沉入杯底,若向杯中逐渐加盐并搅拌,下列分析正确的是(  )

A.鸡蛋所受浮力不变

B.杯底所受压强不变

C.杯底所受压力不变

D.鸡蛋所受重力不变

题型:选择题

从甲城到乙城,快车需要12小时,慢车需要15小时,如果两列火车同时从甲地开往乙地,快车到达乙地后,立即返回,问又经过几小时与慢车相遇()

A.2

B.

C.1

D.

题型:选择题

CustomaryTare

更多题库