语法填空 请适当注明解析 THE 2,298-kilometer Beijing-Guangz语法填空 请适当注明解析 THE 2,298-kilometer Beijing-Guangzhou High-speed Railway 16_____ (official) opened to passengers on December 26,2012.It is the world s longest high-speed rail route.The 17_____ (design)speed of the track is 350 km^,though speeds during the initial period of operation will be limited to about 300 km/h.The new route cuts the travel time between Beijing and Guangzhou 18 almost two thirds,from 22 hours to roughly eight hours .On December 1,2012,not long before the opening of the Beijing-Guangzhou High-speed Railway,the Harbin-Dalian High-speed Railway,19_____ first high-speed line ever to cross land that lies frozen for almost half a year,began operations,20_____ allows passengers to appreciate the view off the coast from Dalian in the morning,21_____ the winter snowscape of frosty Harbin in the afternoon .At present the total 22_____ (long) of high-speed lines in China 23_____(reach)9,349 km.With four main lines 24_____ (run) east-west and four north-south,the country s high-speed train network is the world s largest.China plans to expand 25_____ high-speed railway network to 50,000 km by 2020,to cover almost all large and medium-sized cities.
16 Office专有名词,17 designed设计的（被设计的,设定的）,18 by（减少了,Ps.根据后文为8小时说明是减少了三分之二,若是减少至三分之二则应该为to）,19 the（插入语,类似adj）,20 which非限定定语从句,21 of (此处跟前面off the coast from Dalian是并列的,前面有逗号,此处可以不用填写或者写上of 表示The view of the winter...) 22 length长度,23 reachs(reaches 表示陈述事实,has reached也可以吧,感觉表示一种成就),24 running(with后面V-ing) 25 the（限定词,或者写个present 现在的）—————以上纯属个人兴趣爱好填写,正确答案还需参考原答案.
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扫描下载二维码杜老师奥数答案×297= 积的各个数字的和=06-86=223220－3－……－27－28300－298+296－294+…+16－14=(1+3+5+…+1003) －(2+4+6+…+1002)=数列2,5,8,11……第20个数是（ ）,第40个数是（ ）数列6,10,14,……共30个数的和是（ ）,21个连续偶数的和是1890,这21个数中最小的是多少?甲地有58吨货物要运到乙地,大货车每次载7吨,小货车每次载4吨,大货车运一趟耗油14升,小货车运一趟耗油9升,运这批货物最少耗油多少升?有一水池,池底有泉水不断涌出,要想把水池的水抽干,12台抽水机需抽9时,10台抽水机需抽12时,如果40台抽水机,需用多少小时抽完?有一楼梯共8级,规定每次只能跨上一级,两级或三级,要登上第8级,共有多少种不同走法?
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扫描下载二维码计算下列各题（能简算的要简算）(1)763+298(2)0.25*0.25*16(3)19.9*99+19.9(4)24*23分之22_百度知道
计算下列各题（能简算的要简算）(1)763+298(2)0.25*0.25*16(3)19.9*99+19.9(4)24*23分之22
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11数学资源方法gdshuxue网.9*99+19;4×4×4=1(3)19.9×（99+1）=1990(4)24×23&#47数学资源方法gdshuxue网.25*16=1/4×1&#47.9=19;22=12×23&#47，免费习题试题提供(1)763+298=1061(2)0.25*0
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25*4）=1*1=1(3)19.9*（99+1）=19.9*100=1990(4)24*23分之22=24*（1-1/23)=24-24&#47(1)763+298=763+300-2=1061(2)0.25*0.25*16=（0.25*4）*（0.9*99+19.9=19
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出门在外也不愁-…-22-2=2的100次方减2的99次方一直减到2的一次方等于多少?
2^100-2^99-2^98````-2=(2^99*2)-2^99-2^98````-2=(2^98*2)-2^98````-2=2^2-2=22^100可以看做是2^99在乘2,由此可得,减到后面就剩下2^2-2=2不知道这样你是否明白?`````
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