如图所示，实线表示某静电场的电场线，虚线表示该电场的等势面．下列判断正确的是_刷题宝

题干

如图所示，实线表示某静电场的电场线，虚线表示该电场的等势面．下列判断正确的是（）

A：同一电荷在1、2两点的所受电场力相同

B：同一电荷在2、3两点的所受电场力相同

C：负电荷从点1运动到点2，电场力做正功

D：负电荷从点1运动到点2和从点1运动到点3，增加的电势能相等

上一题下一题 0.0难度选择题更新时间:2018-02-14 12:18:47

答案(点此获取答案解析）

D

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把一个木块放入盛满酒精的溢水杯中，溢出30g的酒精（ρ_木＜ρ_酒），若将此木块从酒精中取出，擦干后放入盛满水的溢水杯中，则溢出的水的质量是（）

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小华在探究“馒头在口腔中的消化”实验中，分别对三支试管进行了如下处理：

序号	处理方法
1	馒头碎屑、2毫升唾液充分搅拌、37℃温水
2	馒头碎屑、4毫升清水充分搅拌、37℃温水
3	馒头碎屑、2毫升唾液充分搅拌、5℃温水

同类题3

用方框所给的选项完成对话。

A: You must be really excited about leaving for America tomorrow, Li Ping!

B: Yeah. ____

A: Nervous about what?

B: I don't know many of the customs and manners in the USA. ____

A: Sure.

B: ____

A: Well, it's important to be on time when you're invited for dinner. ____ Americans expect their guests to be on time.

B: Then how long may I stay there?

A: ____ Or you seem to have come only for the meal. When your friends seem to be getting tired and running out of things, it's time to leave. The next day, call or write a thank-you note to say how much you enjoyed the evening.

A. It's good to stay at home for you.

B. It's impolite to arrive late.

C. Could you give me a hand?

D. What rules do they have in America?

E. But I'm a bit nervous.

F. You're supposed to leave before the meal.

同类题4

设随机变量X满足两点分布，P（X=1）=p，P（X=0）=q，其中p+q=1，则D（X）为（　　）

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