A. You can find our addresses from it.
B. You can find our information from it.
如果x+1+x+9>a对任意实数x总成立,则a的取值范围是( )
用分子的观点对下列现象解释错误的是( )
地球上的海洋面积约为361000000km2,则科学记数法可表示为____ km2.