参数方程求交点距离

乘电梯上楼要30分钟,如果在移动的电梯上再走,则减少到12分钟,问电梯没开走上去要多少分钟? 区分tour .journey.travel 葵花为什么向太阳事实证明不是生长激素作怪,有没有最新答案? police 向日葵为什么向太阳? Chihuahua named Momo (Peach) has passed the exam to become a dog in the police forcein western Japan,in what seems to be a first.in what seems to be a first.什么成分组成, 为什么向日葵会向太阳方向? CHINESE ARMED POLICE FORCE 为什么向日葵向太阳转 the police force的意思还有take sb by force是什么意思 根据汉语完成句子.1.这件毛衣二十五元___ ___ is ____ yuan2.这双鞋是二十五元the pair of___ ___ ___ yuan 根据汉语完成句子的第3题. Almost nobody can stand ----fun of before a crowd of people.Almost nobody can stand -------fun of before a crowd of people.A.to be made B.to make C.being made D.making希望有理由! 30.________ by a crowd of people, I felt nervous, ______ what to say. A．Watching, didn't know B．Having watched, and not knew C．Having been watch, not known D．Being watched, not knowing答案为D. 请问为什么不能用A Don't stand by the gate ,( )you come in( )you go out to play.A.either or B.neither,nor C.not only ,but also D.not,but 向日葵是向太阳光还是向太阳热的 3.He suddenly saw Sue___the room.He pushed his way___the crowd of people of getting to her.A.across ,through B.over,through c.over ,into d.across ,across 请用图的形式说明日晷的工作原理 voyage,travel,sail,trip,tour,journey的辨析希望准确点,并给个例句! travel trip tour journey单词辨析指出用法的不同点,相应给出例句.多谢 __ __ the street corner,there is a police car.A.In B.At C.To D.By There is a police car ----------- the bus.The police are watching the trafficA.in front of B.in the front of C.in the front 要讲清语法 there they saw a car with the w____"police" on it.w填什么词呢?急 there they saw a car with the w_____"police"on it.w 填什么?急 there is a police car by the street tina likes goningshopping a lot.lucy likes going shopping ,too.改为同义句 英语高手请进,Quite a few people used to believe that disaster ___if a mirror was broken.A.was sure of striking B.was sure of having struck D.was sure to strike可书上两句型都有：be sure /certain of sth be sure /certain to do sth还有 Quite a few people used to believe that disaster was sure___if a mirror was broken.(A) of striking(B) of having struck(C) of struck(D) to struck并请说明理由,对不起，D选项中struck一词误，应为strike Quite a few people used to believe that disaster ____ if a mirror was broken .A.was sure of striking B.was sure of having struck C.was sure to be struck D.was sure to strike 为什么选D,请详解, 怎么判定遗传基因在哪个染色体上 People used to say,“The hand that rocks the cradle rules the world.” And “56 every successful man there’s a woman.”　　“ 57 these saying mean the same thing.Men 58 the world,but their wives rule them.　　Most of the American wom Quite a few people used to believe that a disaster _____ if a mirror was broken.A was sure of striking B was sure of having struck C was sure to be struck D was sure to strike