This paper presents an induction motor drive system assisted by an 80C196 KB 16-bit microcontroller which implements a speed adjustment numerical algorithm with static control of torque for a variable speed induction motor. In order to obtain a constant U/f characteristic, we calculated the chopping...
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17.设等比数列{an}的公比q=1212,前n项和为Sn,则S3a3S3a3=( ) A.5B.7C.8D.15 试题答案 在线课程 分析利用等比数列的通项公式与前n项和公式即可得出. 解答 3 a1(1−123)1−12a1(1−123)1−12 74 a1 3 a1(12)2a1(12)2 14
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National and Regional Tourism Planning: Methodologies and Case Studies, Urban Environmental Management: Environmental Change and Urban Design, Writing the City: Eden, Babylon and the New Jerusalem, the Urban Experience: A People€"Environment Perspective, Malign Neglect: Homelessness in an American City...
分析:根据数列{an}的递推公式,可以逐项求解.由于项数较多,可注意到各项的值是否会出现一定的变化规律,从而为计算带来方便. 解答:解:由于an+1=1- 1 an 且a1=2所以a2=1- 1 a1= 1- 1 2= 1 2a3=1- 1 a2= 1- 1 1 2=-1a4=1- 1 a3= 1- 1 (-1)=2a5=1- 1 a4= 1- 1 2= 1 2…...
Xi'an City boasts one of the most well-preserved ancient city walls in China. As China's Cultural and Natural Heritage Day falls on Saturday, a local family shares the history and changes of the city wall through ...
温州市华达利植绒有限公司创设于1998-03-24 。公司地点位于浙江温州工业园区中兴路102号全心致力于植绒、合成革制造、加工。等服务公司现有优秀的员工20-99人,公司类型为有限责任公司自然人独资。是一家在温州市不断发展的电子商务公司。 工商信息 温州市华达利植绒有限公司 ...
∴AN2=AM•AD;故②正确; ∵AE2=AM•AD, ∴22=(2-MN)(4-MN), 解得:MN=3-√55;故③正确; 在正五边形ABCDE中, ∵BE=CE=AD=1+√55, ∴BH=1212BC=1, ∴EH=√BE2−BHE2−=√5+2√55+25, ∴S△EBC=1212BC•EH=1212×2×√5+2√55+25=√5+2√55+25,故④错误; ...