四个悬挂着的轻质小球,相互作用情况如图所示,则对小球带电情况的判断正确的是 A

题型:选择题

问题:

四个悬挂着的轻质小球,相互作用情况如图所示,则对小球带电情况的判断正确的是

A. A、B、C球一定带电,D球可能不带电    

B. A球可能不带电,B、C、D球一定带电

C. A、B球一定带电, C、D球可能带电    

D. A球一定带电,B、C、D球可能不带电

考点:电流的形成
题型:选择题
某校八年级一班20名女生某次体育测试的成绩统计如下:
成绩(分)60708090100
人数(人)15xy2
(1)如果这20名女生体育成绩的平均分数是82分,求x、y的值;
(2)在(1)的条件下,设20名学生本次测试成绩的众数是a,中位数为b,求
a
-
b
5
的值.
题型:选择题

完成句子

小题1:My aunt is from Canada. (改为同义句)

My aunt           from Canada.

小题2:There is some money for her.   (改为否定句)

There                      money for her?

小题3:There is a supermarket across from the park.   (改为一般问句)

__________  __________ a supermarket across from the park?

小题4:It’s rainy today.   (就划线部分提问)

__________ the weather today?

小题5:She often plays soccer after school. (用now改写句子)

She __________  ___________ soccer now.

小题6:你想成为什么样的人?

__________ do you want to __________?

题型:选择题

Two teaspoons of milk______than a cup of milk.[ ]

A. is more    

B. is less    

C. are more    

D. are less

题型:选择题

在互相独立的系统中,选择和确定具有功能互换性或尺寸互换性的子系统或功能单元的标准化形式叫通用化。

题型:选择题

Are you interested in seeing the beautiful fall foliage of New England but tired of traffic jams and overbooked hotels Then this year forget the crowds in New England and see the beautiful colors of autumn in the Catskills.
These rugged mountains in New York State, just 90 miles northwest of New York City, are famous for the legendary tales of Rip Van Winkle, and more recently for the summer hotels mat sprang up in the region during the 1940s, 1950s, and 1960s. Families trying to escape the heat of New York City found the Catskills to be the perfect place to stay for a month or so each summer. By the late 1950s there were over 500 resorts and hotels offering nighttime entertainment as well as all kinds of outdoor activities. Famous comedies like Jackie Gleason, Joan Rivers, and Sid Caesar all got their start touring the hotel clubs here. Since the introduction of air-conditioning and cheaper air travel, however, families have stopped coming to the Catskills in such large numbers, chasing instead more distant locations at different times of the year. Many of the Catskills hotels closed in the 1970s, but some remain and have expanded and changed their facilities to meet the needs of today’s visitors.
Currently, there are many activities available to the traveler besides witnessing the changing colors of the leaves. There is an all-organic sheep farm where visitors can see how a traditional sheep farm operates. There are also hundreds of miles of scenic drives in the area. Route 42, for instance, is an excellent site for spotting bald eagles. For more information on vacations in the Catskills, call the office of Public Information.

The word "rugged" underlined in Paragraph 2 means ______.

A. barren
B. rough
C. tall
D. lush

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