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什么是信道冲激响应 ,OFDM的信道估计中 OFDM正交性怎么证明? OFDM正交频分复用为什么频谱叠加不互相干扰正交的概念我知道,只是不知道为什么正交之后频谱叠加了不会互相干扰啊.“OFDM系统中各个子信道的载波相互正交,它们的频谱是相互重叠的,这样 已知2分之派 There is a growing _____ among doctors.There is a growing _____ among doctors of the need for more prevention treatment.A.recognitionB.improvementC.definitionD.pressure怎么翻译啊? There were also some singers in Valley Park.（改为否定句） There were not_____singers in Valley ParkThere were not_____singers in Valley Park_____. 《小圣施威降大圣》本文是围绕哪个字推进故事情节的 已知角a∈[0,2π）,绝对值cos a 如果在比例尺为1：100000的地图上量得AB两地间的距离是5厘米,那么AB两地间的实际距离为 米 完形填空：My husband and I traveled to London for some days.We went there in__1__.We think完型填空　　My husband and I traveled to London for some days.We went there in 1 .We think it's the best time to visit England.The 2 is usually pleas 已知函数f(x)=log0.5(x^2-ax+3a)在区间【2,正无穷）上是减函数,则a的取值范围? 《小圣施威降大圣》主要内容 we will ruck you 的歌词谁知道 甲乙两地的实际距离是400千米,在一幅地图上量得两地之间的距离是25厘米.这幅地图的比例尺【】.A.1：16B.1：16000C.1：1600000 The two things _____ he wasn't sure were the grammar and the idioms.A. about whichB. about that C. in whichD. at which选择哪一个?为什么? Some of the things some people,only to miss 包括单项选择的1-5题 system英文意思 digestive system的器官功能(英语)不用太详细的,最好只要一,两句话的只要主要功能在digestive system就行了1.mouth2.salivary glands3.esophagus4.liver5.stomach6.gallbladder7.pancreas8.large intestine9.small intestine10.rectum1 买一辆汽车,分期付款买要加价7%,现金买可按九五折.王叔叔一算,分期付款比现金买要多付7200元,这辆车...买一辆汽车,分期付款买要加价7%,现金买可按九五折.王叔叔一算,分期付款比现金买要 在一幅比例尺是1:4000000的地图上,量的AB两地的距离是2.5厘米,这两地的实际距离是多少千米?用思维转化法解答 Oh,what a sunny day!The sun _____(shine)and the birds____(sing) 在比例尺是1:4000000的中国地图上,量得两地的距离是30厘米,这两地的实际距离是（ ）千米. f(x)=(2-3a)x-1,x小于1 f(x)=-loga^x,x大于等于1 f(x)是R上的增函数,则a的取值范围是? 安井豆沙汤圆怎么做比较好? 孩子快上小学了,有关幼小衔接问题我们也不是很了解,需要上幼小衔接班吗? 安井豆沙汤圆安井汤圆系列豆沙汤圆总共有几种包装?有朋友知道的吗帮个忙! strange strange things 紧急! strange things are happening Strange things are happening翻译成中文是什么意思? in the countryside还有collection stamps, 是in countryside还是in the countryside?countryside前要不要加the 还有 country中 in the country中the不能省略吗?