A:H+、Na+、OH-
B:Na+、NO3-、Cl-
C:K+、H+、HCO3-
D:Ca2+、SO42-、CO32-
有四包真空小包装火腿,每包以标准克数(450克)为基准,超过的克数记作正数,不足的克数记作负数,以下数据是记录结果,其中表示实际克数最接近标准克数的是( )
Many fast food restaurants paint their walls red, play loud music and have hard seats_____ customers eat quickly and leave.
已知函数f(x)=log4x,x>03x,x≤0,则ff(116)=( )