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线面成角在立体几何中如何证?二面角如何找?不太擅长三垂法 May i have the pleasure to make a friend with you I knew you from ZhiDao of BaiDu.Your oral english must be great .A foreign client will visit our company but I can't speak out in english .May I have the pleasure to make a friend with you My MSN is g i hope you can have a good time during the may day we ( ) five ping-pong balls.A.doesnot have B.have c .has 把棱长3厘米的正方体橡皮泥.捏成底面积是3.14平方米的圆柱体,高是多少 把一个棱长是2分米的正方形削成一个最大的圆柱体,他的侧面积多少分米? 把一个棱长是10分米的正方形木削成一个最大的圆柱体,求这个圆柱体的面积?个年 求大学英语四级听力资源,在线等······ my mother works in a hospital.改为一般疑问句 your brother works in a factory (a hospital)改成选择疑问句 May you have a ( )trip A.please B.pleasure CMay you have a ( )trip A.please B.pleasure C.pleasant D.pleased 给我一个有九年级句型转换题答案的网站!里面有1.My mother works in a hospital .（改为一般疑问句）还有别的 1.May I have the ______(polite enjoyment gained by doing or having sth) of the next dance with you?2.He went ______(ill in the mind) and had to be put into a mental hospital. Is there a boat in the river?用肯定和否定回答 May i have the next dance? where ____?i am looking for everywhere A.have you gone B.have you been Hi Jim Where have you ____ Li Lei is looking for you .填 been还是gone 为什么,请详解, There is a boat __ the river and a boy sits __ it.A.in,in B.in,on C.on,in D.over,onHis f__________ lesson is maths. there is a boat on the river中的is可以改为have么 初中英语零基础,高中怎么办阿.再过几天要开学了. there is a river in the picture.there are some ducks and a boat on the river.是什么意 字母R的前面应该是a还是an?应该是：It's a R.(书上出现的是这样）It's an R.到底哪个是正确的?为什么? 遇见哪些字母时前面用an,反之用a 例如：an apple{一个苹果}.a dog{一只狗}.好像有12种情况前面用an{遇见字母a e i o u m n s f x h ..}还不全, 人生就像愤怒的小鸟.当你失败时,总会有几只猪在笑 英文怎么说? "人生就像愤怒的小鸟 当你失落时 总有几头猪在笑"请把这句话翻译成英文,因为要上外网, 连词成句：1kite sky a the in there is（?）2any the there river are in（?） 如何证明线面平行 ---------------证明线面平行如图,ABCD,ABEF均为平行四边形,M,N分别为对角线AC,FB上的点,且有AM/FN=AC/BF.求证 MN平行于平面CBE We can have the chips_____.选择A.to the open air B.in the open airC.in the open airs D.on the open air请说下理由好吗 证明：线面平行已知A、B、C、D四点不共面,M、N分别是△ABD和△BCD的重心,求证：MN‖平面ACD 为什么rolling in the deep 里的 we could have had it all 是唱成we could 德had it all 这里是不是存在连读什么的? 要一本袖珍版的英语单词书》》》》》最好是64开 估计没有比这个更小了吧 呵呵