穿過一閉合回路的磁通量隨時間的變化關系為Φm=2t2+t(SI)，則t=0時回路中的感應電動勢為（）
Therediscoveryofthisspeciesofbirdsisoneofthemost___(ordinary)scientificfindingsinrecentyears.
Theyknewtheyhadto________actiontodealwiththeplaguebeforeitspreadtootherareas.
Weknewtheboss________beangryifwedidn’tfinishtheworkintime.
Youmayusebike________yougiveitbacktometomorrowmorning
