Lucy writes as ______ as Lily. They are both good students.
A:careful
B:carefully
C:more careful
D:more carefully
用高铁酸钠(Na2FeO4)对河湖水消毒是城市饮水处理的新技术.已知获得高铁酸钠的反应为:Fe2O3+mNa2O2=nNa2FeO4+Na2O,下列说法中正确的是( )
已知函数f(x)=lnx,则函数g(x)=f(x)-f'(x)的零点所在的区间是( )
____
如图,△ABC中,DE∥BC,AD:DB=1:2,下列选项正确的是( )