【简答题】In 2013 alone at least 20,000 African elephants were killed for their teeth. In South Africa over the last two years more than 2,200 rhinos were killed for their horns. These numbers are alarming, bec...
【单选题】若 是偶函数,且定义域为[a-6,2a] 则a= b=
【判断题】根据视频1.2,请判断下面说明是否正确: 电子商务在未来发展过程中,更重要的是为用户提供性价比高的产品和服务,用户体验不需过多考虑。
【单选题】已知f(x)是定义域为R的偶函数,若f(x+2)=f(x),且当x∈[1,2]时,f(x)=x 2 +2x-1,那么f(x)在[0,1]上的表达式是( )
【简答题】我每天放学后看卡通片,但昨天我没有看,我做家庭作业了。