（2011•常德）如图，已知⊙O是△ABC的外接圆，且∠C=70度，则∠OAB= ．
缺词填空 Chinese pianist Lang Lang arrived at 56th Grammy Awards (格莱美奖) at Staples Centre on Sunday, January 26,2014, in Los Angeles. L 1 every successful person, Lang went throu
配平下列反应 (1) KMnO4+ HCl—— KCl+ MnCl2+ Cl2↑+ H2O(2) + SO2+ H2O—— Mn2++ H++
下列说法中,正确的是( )A.数列1,3,5,7可表示为{1,3,5,7}B.数列1,0,-1,-2与数列-2,-1,0,1是相同的数列C.数列{}的第k项为1+D.数列0,2,4,6,8,…可记为{2n}
右图为某一遗传病的系谱，下列有关叙述错误的是( )A．该遗传病为常染色体显性遗传病B．3号和4号均为杂合子C．7、8产生致含病基因配子的概率都是2/3
