已知半径分别为2和3的两个圆有两个交点,则圆心距d的取值范围是______.

题型:填空题

问题:

已知半径分别为2和3的两个圆有两个交点,则圆心距d的取值范围是______.

考点:圆和圆的位置关系(圆和圆的相离,圆与圆的相交,圆与圆的相切)
题型:填空题

阅读理解

      Dick and Ellen come from America. Now they are in Tianjin. Every morning they get up very early.

Then they go to work by car. They start their work at 8:30. They are very busy. They have lunch at 12:30. After lunch they work again. They finish their work at 5:30 p.m. In the evening they take Chinese lessons. They want to learn Chinese. They want to talk with Chinese people. They often say "Chinese people are

very friendly". They like to stay in China and they like to work with Chinese people.

1. Where are Dick and Ellen?

A. In America.

B. In Beijing.

C. In Tianjin.

2. Do they get up very late every morning?

A. Yes, they do.

B. No, they don’t.

C. No, they doesn’t.

3. When do they begin to work?

A. 8:00.

B. 8:30.

C. 9:00.

4. What do they do in the evening?

A. Stay at home.

B. Watch TV.

C. Take Chinese lessons.

5. Why do they want to learn Chinese?

A. Because they like Chinese.

B. Because they like China.

C. Because they want to talk with Chinese people.

题型:填空题

由于某著名品牌的食品企业弄虚作假,被媒体连续曝光,你会()。

A.不再相信食品是安全的

B.吃东西时,总是感觉不放心

C.不把这当回事儿

D.不再吃这家企业的食品

题型:填空题

计重收费关于“轴限”和“轴型”的相关概念正确的有()

A、不同数量轮胎和车轴的组合类型称之为轴型

B、不同轴型的顺序编号称之为轴型编号

C、轴(轴组)的分解载重量称为轴限

D、各轴(联轴)的载值之和称之为总轴限

题型:填空题

下列关于CD-R光盘的描述中,错误的是______。

A.只能写入一次,可以反复读出的一次性写入光盘

B.可多次擦除型光盘

C.以用来存储大量用户数据的,一次性写入的光盘

D.CD-R是Compact Disc Recordable的缩写

题型:填空题

《北京市安全生产条例》规定,生产经营单位制定的安全生产规章制度应当包括危险作业管理制度。

更多题库