一种正方体形状的包装盒,棱长是2分米。如果要在它的四周贴上一圈商标纸,商标纸的面积是多少平方分米?
4×2×2=16(平方分米)
With many years of working experience, Jack is ___________ for the job.
A.required
B.qualified
C.substituted
D.distributed
对外加剂有何基本要求?