凸面镜和凸透镜的区别

第二题的答案 The old man walked very slowly.中哪个是不及物动词?哪个是介词? 第二题答案是 He drives the car very slowly怎么变感叹句 Some dinosaurs walked very slowly.（对slowly提问）_____ _____ _____ dinosaurs walk? 三棱锥的三条侧棱两两垂直,其长分别是1,根号2,根号3,求1 三棱锥的体积2 三棱锥外接球的表面积和体积 等比数列中,A3A4A5=8,则A2A6等于什么? .______ his head high,the manager walked into the room to attend the meeting ______ then. A.Holding;being held B.Held;holding C.Having held;held D.Held;to be held 我选D为什么错了 正确答案是A Someone got into his room (穿过) the window yesterday afternoon 帮我画个函数图像,不用真画描述下就行!y=1.5^x与y=x^2的交点有几个?我觉得由2个,书上非说是三个! The old man and his wife ___________(走路比较慢) walkersThe old man and his wife ___________ walkers. Once a man and his wife worked for an old man.完形填空Once a man and his wife worked for an old man.There was a big box in the old man’s living room.The old man pointed to the box and said,“There’s only one thing you （1 ）do.Don’t open When the man left the following morning,he t___the farmer and his wife.He took a little bag ofgold pieces out of his pocket.he added that he would come the next y____.(填横线中的词) the old man took the little girl by () hand and they went down the streetA her B a C the D that到底选哪个？ Lightly into the meeting room A the lady walked B did the lady walked答案说B不对 因为walked 要用原形 为什么呢 1,is no reason for firing himA The fact that he disagreed with you B Because he disagreed with you C Owing to disagreeing wit What would you do if an old man fell down开头：a reporter did a survey about "what would you do if an old man fell down?"among 200 students.here are the results.结尾：the rest said it depended on how things went. 是“I saw an old man fall down”还是“I saw an old man fell down”已看到摔倒的全过程 书面表达初三水平：what would you do if an old man fell down开头：a reporter did a survey about "what would you do if an old man fell down?"among 200 students.here are the results.结尾：the rest said it depended on how things went. 英语中the,to,of的用法?在英语里,什么情况下名词前不加定冠词The?一般情况下一定要吗?To在构成动词不定式或无实义时的用法是什么?什么情况下可以不加To,加ing或不加?什么情况下不能用名词 to,the,of怎样用法 已知集合A={a,a+b,a+2b} B={a,ac,ac²}若A=B,求c的值 已知集合A＝｛a.a+b.a+2b｝.B＝｛a.ac.ac｝.若A＝B. 等比数列{an}中,a3a4a5=3,a6a7a8=24,则a9a10a11= 在等比数列an中,a1a2a3=3,a6a7a8=24,则a9a10a11的值等于 在等比数列{An}中,A3A4A5=1,A6A7A8=512,则数列{An}的公比q为? key to the door短语中为什么用to?可以用of么?如果可以,它们两个有什么区别么? [x(x的平方y-xy的平方)-y(x的平方-x的平方y)]除以2x的平方y 速求;((xy+1)(xy-2)-2x的二次方y的二次方+2)除以(xy)=? Mary is walking ___the sofa to the door(填适当的介词) 证明一道关于集合的问题.最基础的概念题. 证明（一）定义与命题的题,两条直线相交成直角,就叫做两条直线互相垂直,这个句子答案给的是定义,我咋觉得是命题哩? 50比一个数的30%多10,求这个数