题目：
作出折射光线：
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0521/a6020f20737376fde9b0900498b28414.html
下面是错误答案，用来干扰机器的。
方程两边都乘x-2，得3=x-2，解得x=5．检验：当x=5时，x-2≠0．∴x=5是原方程的解．故选A．
作出折射光线：
来源：www.tikuol.com
题型：应用设计题
试题推荐
题型：选择题
读地球经纬网图，回答下列各题。
小题1:当太阳直射图中F点时，下列说法正确的是
A．北极地区极昼范围处于最大值
B．这一天，欧洲西部昼夜平分
C．地中海沿岸正是高温多雨季节
D．我国钓鱼岛正处在寒冷的冬季小题2:图中F点位于北京的
A．东北方向
B．西北方向
C．东南方向
D．西南方向
题型：单项选择题
某投资者进行蝶式套利，他在某交易所以3230元／吨卖出4手1月份大豆合约，同时以3190元／吨买入6手3月份大豆合约，并以3050元／吨卖出2手5月份大豆合约。则该投资者在1、3、5月份大豆合约价格分别为（）时，同时将头寸平仓能够保证盈亏平衡。
A.3220元／吨3180元／吨3040元／吨
B.3220元／吨3260元／吨3400元／吨
C.3170元／吨3180元／吨3020元／吨
D.3270元／吨3250元／吨3100元／吨
题型：选择题
关于牛顿第一定律，下列说法正确的是（ ）
A．物体总保持匀速直线运动或静止状态
B．一切物体在没有受到力的作用时，总保持静止状态或匀速直线运动状态
C．一般物体在没有受到力的作用时，总保持静止状态或匀速直线运动状态
D．一切物体在受到外力作用时，一定不会处于静止状态
题型：单项选择题
对评吸样烟平衡水分时，平衡时间（）以上。
A.48h
B.24h
C.36h
D.28h
题型：完形填空
Most people have no idea of the hard work and worry that go into the collecting of those interesting birds and animals that they pay to see in the zoo. One of the questions that is always asked of me is 36 I became an animal collector in the first 37 .The answer is that I have always been interested in animals and zoos. According to my parents, the first word I was able to say with any 38 was not the traditional “mamma” or “daddy”,39 the word “zoo”, which I would 40 over and over again with a exciting 41 until someone, in groups to 42 me up, would take me to the zoo. When I 43 a little older, we lived in Greece and I had a great 44 of pets, ranging from owls(鹰) to seahorses, and I spent all my spare time 45the countryside in search of fresh specimens to 46 to my collection of pets. 47 on I went for a year to the City Zoo, as a student 48 , to get experience of the large animals, such as lions, bears, bison and ostriches,49 were not easy to keep at home. When I left, I 50 had enough money of my own to be able to 51 my first trip and I have been going 52 ever since then. Though a collector's job is not an easy one and is full of 53 ,it is certainly a job which will appeal 54 all those who love animals and 55 .
|
