搜题请搜索小程序“爱下问搜题”
问题 填空题
竖直向上抛物体高度h和时间t符合关系式h=v0t-
1
2
gt2，其中重力加速度以10米/秒2计算．爆竹点燃后以初速度v0=20米/秒上升，则经过______秒爆竹离地20米．
答案

依题意，把h=20，v0=20，g=10，代入h=v0t-

1
2
gt2，

20×t-

1
2
×10×t2=20，

解得t1=t2=2秒．

选择题

短文改错 (共10小题；每小题1分, 满分10分)

假设英语课上老师要求同桌之间交换修改作文, 请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。错误涉及一

个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号（∧）, 并在其下面写出该加的词。

删除：把多余的词用斜线（＼）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1、每处错误及其修改均仅限一词；

2、只允许修改10处，多者（从第11处起）不计分。

This morning I went to the supermarket, buying a toy and went to see my nephew , a 8-year-old boy named Jack. She was playing with some of his friend in the yard when I arrived there. The moment he found that I came to see him with his most favorite toy, Jack jumped with joy. Every boy and girl present wanted very much to have a look the toy. However, Jack doesn’t want his friends to see it. He was about to hide the toy then I stopped him. “Let your friends to play with your toy as well, Jack — you must learn to share.” I said. Realized that he was wrong, Jack played with the toy together with his friends.
查看答案
单项选择题

某省高级人民法院二审时因无法排除合理怀疑，将一审判决犯罪嫌疑人死刑缓期执行的案件改判无罪，下列名言可以解释二审法院这样判决的是（）。

A.一次不公的裁判比多次不平的举动为祸尤烈。因为这些不平的举动不过弄脏了水流，而不公的裁判则把水源败坏了

B.世界上唯有两样东西能让我们的内心受到深深的震撼，一是我们头顶上灿烂的星空，一是我们内心崇高的道德法则

C.法律的制定是为了惩罚人类的凶恶悖谬，所以法律本身必须最为纯洁无垢

D.如果法律是非正义的，它就不能存在
查看答案