机械工程测试技术基础(第三版熊诗波_黄长艺)课后习题及答案详解

机械工程测试技术基础(第三版熊诗波_黄长艺)课后习题及答案详解内容摘要：

ws us t o war m applause f or t heir wel e and t hanks! Below, I f ir st Dist rict Comm it ee m em ber of t he 20XX t eam annual democr at ic meeting im plementation of t he cor rect ive m easur es , as well as m ember of t he t eam and of m y own r epor t guidelines f or t he im plem ent at ion of t he independent Commission against cor r uption stat ement invit ed leader s and r ades cr itcism. Fir st, annual part y on t he 20XX t eam, M ember of democr atic lif e act ion plan im plem ent at ion year 20XX, distr ict dem ocr atic m eet ing a m em ber of t he t eam on st udy and pr actice t he scient ifc Out look on developm ent t hem e, f ind a pr oj ect support ing st rong enough, t he indust r y well enough, ur ban constr uction m anagement level needs t o be im pr oved, livelihood im pr ovem ent needs t o be str engt hened, distr ict eam it self, such as t he f ive aspect s. Year of 20XX, we find out he pr oblem s m entioned above, based on act ual Shunqing constr uction and developm ent, conscientiously sum up im pr ovem ent s, achieving signifcant developm ent r esult s and ef fect iveness of t heir wor k. ( A) highlight t he pr oj ect handle, m aintain high gr owth of invest ment . Adher e t o t he str ategy as a Foundation, carr ying out pr oj ect s t o pr om ote inc reased st amina im por tant. One is t o incr ease t he int ensit y of pr oj ect s t owar ds. Actively seek nat ional and pr ovincial policy support , super ior special t r ansf er paym ents, a variet y of addit ional ine wil t op 700 milon Yuan, a number of key inf r astr uct ur e pr oject s, livelihood pr oject s, industr ial pr oj ects int o t he cage. Second, incr easing t he pr oject att ract s. This year a t ot al of 23 signed a major pr oj ect, of which 14 bilon pr oj ect, China M etallur gical gr oup, vanke gr oup, Guangdong hengda gr oup, Taiwan Ruentex gr oup, on t he RI gr oup, Shenzhen Kaisa, jif eng agricult ur al m achinery, M er cedes Benz, Audi 4S st or e and other lar ge enterpr ises and projects have set tled in Shunqing. Third, st rengt hen project constr uction. Anual im plementation f ocus pr oj ect 39 a, f ixed asset s invest ment tot al wil br eakt hr ough 12 bilon yuan, cr eat ed distr ict yilai hist ory high, Sout h door dam, and f ive in shop old cit y t ransfor mat ion, and Ying China industr ial concent rated dist rict const ruction, and cit y main r oad construction, and Nort heast st eam Tr ade Center, and m odern f ar mer s industr y Park, and vocational educat ion city, and low r ent al, and also r om constr uct ion, and f eat ur es blocks build, and farmer s mar ket t r ansf ormation, and rural version St reet t ransfor mat ion, f ocus engineering speed up im plement at ion, eff ectiveness obviously. Expected to be achieved t his year , ar eawide GDP 17 bilon 12 求正弦信号 0( ) sinx t x ωt 的绝对均值xμ和均方根值 rmsx。 解答： 0 0 0 02 20 00 0 02 2 4 211 ( ) d s in d s in d c o sT TTTx x x x xμ x t t x ω tt ω tt ω tT T T T ω T ω π         22 2 2 00r m s 00 0 01 1 1 c os 2( ) d si n d d2 2T T Txx ω tx x t t x ω t t tT T T       13 求指数函数 ( ) ( 0 , 0 )atx t A e a t  的频谱。 解 答 ： ( 2 )220 220 ( 2 )( ) ( ) ( 2 ) 2 ( 2 )a j f tj f t a t j f t e A A a j fX f x t e d t A e e d t Aa j f a j f a f                22() ( 2 )kXf af  I m ( ) 2( ) a r c ta n a r c ta nR e ( )X f ff X f a    14 求符号函数 (见图 125a)和单位阶跃函数 (见图 125b)的频谱。 || φn π/2 π/2 ω ω ω0 ω0 3ω0 5ω0 3ω0 5ω0 2A/π 2A/3π 2A/5π 幅频图 相频图 周期方波复指数函数形式频谱图 2A/5π 2A/3π 2A/π ω0 3ω0 5ω0 ω0 3ω0 5ω0 单边指数衰减信号频谱图 f |X(f)| A/a 0 φ(f) f 0 π/2 π/2 t hr if t of excellent tr adit ional and style lack deep of under st anding, onesided t hink in now of good sit uat ion Xia, economic smooth more f ast development, and r ef or m made m aj or progress, and people living signifcantly im pr ove, and social t he career made new pr ogress, no necessary always hard has, no awareness t o China also has many pover ty area, and also has many pover ty populat ion of exist s, m ore living im pr ove has, m ore need keep har d of style. Three is not str ictly honest. Total t hought unit s i a wat er sector, clean self discipline away f rom himself t oo far, no r eal pr ocessing good living of impr ove and hard, and thr ift excelent t raditonal of relationship, no ef fective do ply wit h Const it ut ion and part y of regulat ions m ust f rom I do up, no r ight m er cy good bit ter Le, and wealt h of r elationship, no r ight awareness t o in ply wit h Const it ut ion and party of regulat ions aspect s everyone has account abilt y. Four, futur e dir ect ion and impr ovement measures 1, belief and fait h, strengt hen part y spir it. One is t o f ir mly establish t he noble ideals of st rugle f or t he ideals of munism, munist str uggle for lif e, r eady t o sacrif ice everyt hing f or t he par ty and t he people. Second is t o cont inuously im prove t he qualit y and standard of polit ical, conscientiously st udy Deng Xiaoping t heory and t hr ee r epr esent s im por tant t hought and t he scient ifc Out look on development , im plement he par ty39。 s basic progr am for t he primar y st age of socialism, adhere t o t he cor ect polit ical or ientation, m aint ain highly consistent wit h t he CPC entr al Com mit ee, is god at t heories of socialism wit h Chinese char act er istics t o analyze and solve problems. Thir d, str engthening t he part y spir it and t he wor ld tr ansform at ion, per sever ance of t he part y Const itut ion, relive Part y vows t o est ablish cor ect wor ld Outlook, Outlook on lif e and t he world, practically embodies ideals and belief s int o act ion, bine lof ty ideals and practical act ivit ies, t r ansforming t he object ive wor ld, actively participate in。