透镜是利用光的折射规律制成的，如右下图所示，对光有会聚作用的有_1，对光有发散作用的有_2._刷题宝

题干

透镜是利用光的折射规律制成的，如右下图所示，对光有会聚作用的有____，对光有发散作用的有____.

上一题下一题 0.0难度选择题更新时间:2018-10-17 02:23:50

答案(点此获取答案解析）

bce,ad

同类题1

底面积为100cm²的容器中装有水，水面浮着一木块。容器底部受到的压强为1980Pa，若取走木块，容器底部受到的压强为1490Pa，则木块重为____ N。

同类题2

下列各句中，没有语病的一项是 ( )

同类题3

﹣3的绝对值是（　　）

同类题4

I had wanted to help you last night but I couldn’t spare any time．for I_____an essay that is due this morning．

同类题5

用所给词的适当形式填空

①I____ (have/has)told him the news.

②She____ (have/has)come back from school.

③Did you____ (won/win)the first prize yesterday?

④There is a farmer____ (called/calling)Tom.

⑤It doesn’t need____ (to be/being)true.

⑥Her job is____ (to clean/cleaned)the streets.

⑦I____ (beat/won)him in the tennis game yesterday.

⑧ Has he____ (visited/visiting)the Great Wall?

⑨I can’t afford____ (buying/to buy)the building.

⑩ Class begins. Stop____ (talking/to talk).

小学学科试题库

初中学科试题库

高中学科试题库