如图,带电粒子射入一固定的、带正电的点电荷Q的电场中,沿图中实线轨迹从a运动到b

题型:选择题

问题:

如图,带电粒子射入一固定的、带正电的点电荷Q的电场中,沿图中实线轨迹从a运动到b,a、b两点到点电荷Q的距离分别为,且b为运动轨迹上到Q的最近点,不计粒子的重力,则可知(   )

A.运动粒子带负电

B.b点的场强小于a点的场强

C.a到b的过程中,电场力对粒子不做功

D.a到b的过程中,粒子动能和电势能之和保持不变

考点:电场强度的定义式
题型:选择题

Welcome to Franklin Hotel! We will make your stay here as enjoyable as possible. We hope we will give you the best service.

★Room Service: You can use the service 24 hours a day.

★Dining Room: You can have three meals a day in the dining room. Breakfast is from 8:00 to 9:30. Also the room waiter may bring breakfast to your room at any time after 7:00 . If you need, please fill in a card and hang it outside your room before 6:00. Lunch is from 12:00 to 14:00. Dinner is from 18:30 to 20:30.

★Telephone: There is a telephone in your room. Dial “0” before you make a call. We will tell you to wait a moment if the lines are busy.

★Shop: The hotel shop is open from 9:00 to 17:30.

★Coffee House: You can drink coffee here at the following times: 12:00 to 14:00, 20:00 to 23:30.

★Another Service: There is a cinema in the hotel. A film begins at 19:00 on Sundays and Wednesdays.

小题1:When can you use the room service?

A.Only the daytime.

B.Only at night.

C.Anytime during a day.

D.Only some time.小题2:If you want to have a meal in your room, what will you do?

A.Phone the service desk.

B.Go to the hotel shop to buy some food.

C.Go to the hotel dining room.

D.Put a message outside the room.小题3:What will you do if the telephone lines are busy?

A.We will ask the service center for help.

B.We will cut off the phone.

C.We will wait a moment.

D.We will use the pay phone.小题4:If you want to have a two-hour business talk in the coffee house, you may go there at_____.

A. 12:00            B: 1:00          C. 10:00            D.11:30

小题5:The instructions tell us that you can__________.

A.go shopping at anytime in the hotel

B.get at least six services

C.see a film when you want to

D.go to the coffee house twice a week.

题型:选择题

以下关于粮食价格鉴证的说法,错误的是( )。

A.粮食价格是百价之基

B.目前全部农产品已完全由市场调节

C.计算粮食产值时,应当考虑不同价格形式的收购比重

D.待售和自食自用的粮食价格鉴证采用市场价格与保护价格就高法

题型:选择题

煮沸灭菌法通常煮沸

A.10~20min

B.20~30min

C.30~60min

D.60~80min

E.80~lOOmin

题型:选择题

以下关于氧气供气系统叙述正确的为( )。

A.气体的贮罐用以平衡日常的用量波动,贮罐与管道并联即可
B.在相同纯度要求的情况下,系统按温度区分
C.当纯度不同时,应按纯度划分系统,并在低纯氧系统中设氧纯化装置
D.氧气供应系统取决于用户的压力、纯度和使用制度

题型:选择题

娱乐体育是指人们在余暇时间进行的一种娱乐性极强的身体活动,它既是一种娱乐手段,又是一种身体锻炼的手段。根据上述定义,下列不属于娱乐体育的一项是( )。

A.几年来,某地每年举办国际风筝节,每次都举行放风筝比赛

B.为了吸引更多的游客,某新建公园举办了一次大型钓鱼比赛

C.北京奥运会前夕,不少单位组织员工进行了拔河比赛

D.为了促进中国篮球事业发展,中国篮协每年都举办CBA比赛

更多题库