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系数函数H(s)经Fourier反变换，就是单位冲激响应h(t)。

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正确

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未知题型
婴幼儿的乳牙要长得好，营养和阳光不可缺少。
单项选择题
根据经验（例如，站间距约为110~150km）初步确定压气站数和布置其余站的位置。这样就等于初步确定全部站址，已知各站的站间距。结果，“预先固定某些站址的压气站布置”就转化为一个工艺核算——调整——再核算的问题。其步骤如下Under the above known conditions, the number of compressor stations and the locations of other stations are determined preliminarily according to experience (for example, the station spacing is about 110~150km). This is equal to the preliminary determination of all stations, known the station spacing. As a result, "pre-fixed compressor station layout of some sites" is transformed into a process accounting - adjustment - re-accounting problem.（）
A、根据经验确定全部压气站的站址和站间距。作出全线布置草图，图上表明各种站场的位置、站间距、各段输气量、各处的进气量和分气量，以及已知的各点压力等According to experience determine all compressor station site and station spacing. Make a sketch of the layout of the whole line, showing the position of various stations, the distance between stations, the volume of gas transmission in each section, the volume of air intake and distribution in each place, and the known pressure at each point
B、根据已知的流量和各站出站的最高压力Pmax，进行各段、各站间的水力、热力计算，得出各站的进站压力PZi+1和各进气点、分气点的压力According to the known flow rate and the highest pressure Pmax of each station, hydraulic and thermal calculation was carried out for each section and station, and the inlet pressure PZi+1 of each station and the pressure of each inlet point and air distribution point were obtained
C、计算各压气站工况，求出各站的出站温度T2，压头H和功率NCalculate the working conditions of each compressor station, and figure out the outbound temperature T2, pressure head H and power N of each station
D、根据各站的变转速特性确定各站的调节方案According to the variable speed characteristic of each station, the adjustment scheme of each station is determined
E、检查各站间和各站的工作参数是否符合要求和合理。Check whether the working parameters of each station and each station are in accordance with the requirements and reasonable
A.（）
单项选择题
在常温常压下，对同种岩石而言，哪种强度最小
A、抗压强度
B、抗剪强度
C、抗张强度
D、抗压或抗张强度
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