在夏季某天的中午，八年级一班的综合实践活动小组为了测量学校旗杆的高度，先将2米的 发布时间：2017-05-03 18:07 │ 来源：www.tikuol.com 题型：选择题 问题： 在夏季某天的中午，八年级一班的综合实践活动小组为了测量学校旗杆的高度，先将2米的竹竿直立在地面上，测得竹竿的影长为0.6米，同时测得旗杆的影长为5.4米．那么旗杆的高度是（ ）A．10.8米B．16米C．18米D．18.8米
题型：选择题 完形填空。 Today is sunny. It's a good day for 1 . So you can see, I'm going for a walk 2 my grandmother. She 3 me an interesting story. But 4 hour later,we are lost. We don't know 5 we are. A policeman 6 us and tells us the right way. We go along、that street and 7 right. Then we 8 a big zoo. Wefind our way! We go into the zoo and see many animals. I like 9 . They are from Australia. At about f'ive o'clock, we get home. 10 my parents know about our story,they laugh. That is very funny, right?( )1. A. running ( )2. A. with ( )3. A. is saying( )4. A. a ( )5. A. how ( )6. A. comes ( )7. A. turn ( )8. A. look ( )9. A. penguins ( )10. A. If B. swimming B. to B. is telling B. the B. where B. is coming atB. go B. see B. tigers B. Before C. walking C. and C. is telling aboutC. an C. who C. comes to C. walk C. meet C. koalas C. When D. sining D. at D. is telling ofD. / D. what D. come to D. run D. watch D. lions D. At 查看答案
题型：选择题 以一定的速度竖直向上抛出一小球，小球上升的最大高度为h，设空气的阻力大小恒为F，则从抛出至落回出发点的过程中，空气阻力对小球做的功为[ ]A．0 B．- Fh C．- 2Fh D．-4Fh 查看答案