A:①②④
B:①③④
C:②③④
D:①②③
金属晶体堆积密度大,原子配位数高,且能充分利用空间的原因是( )
下列关于莫斯科城市建设的说法,不正确的是( )
— My eyesight is getting worse these days. I'd like to have my eyes ______.
— Perhaps you should consider ______ the time on the computer.