函数f(x)=ax2+bx﹣2是定义在1+a,2上的偶函数,则f(x)在区间1,2上是( )
-With the help of the new technology(技术),you ___________ e-mail your friends by mobile phone.
(C2H5SH)。乙硫醇在水煤气燃烧过程中也可以充分燃烧,其化学方程式为:2C2H5SH + 9O2 点燃 4 CO2 + 2Ⅹ + 6H2O,则Ⅹ的化学式为( )