写出下列命题的否定,并判断其真假.(1)3=2;(2)5>4;(3)对任意实数x,x>0;(4)每个正方形都是平行四边形.
用适当的方法解下列方程(本题满分8分)(1)(用配方法) (2)3x(x-1)=2-2x
一定温度下,在2 L的密闭容器中,X、Y、Z三种气体的物质的量随时间变化的曲线如下图所示:下列描述正确的是A.反应开始到10 s,用Z表示的反应速率
The trains___ the travellers who want to go to other places. A. used to carry B. get used to carrry C. are used to carry D. are used to carrying
根据提示补写名句或填写课文原句(10分)【小题1】,但余钟磬音。(《题破山寺后禅院》)【小题2】,她在丛中笑。(《卜算子·咏梅》)【小
Duty is an act or a course of action that people you to take by social customs, law or religion. A. persuade B. request C. instruct
“五·一”黄金周期间,小明与家人到我省大英县的“死海”游玩,这“死海”其实就是咸水湖,当人完全浸没水中时,人受到的浮力_____人受到的重力
--- You haven’t been to Beijing, have you? --- _____. And how I wish to go there again! A. Yes, I have B. Yes, I haven’t C. No, I have D. No, I haven’t