判断题
A.柱边长-保护层*2+1.9d*2 B.柱边长-保护层*2+max(75,10d)*2 C.柱边长-保护层+1.9d*2+max(75,10d)*2 D.柱边长-保护层*2+1.9d*2+max(75,10d)*2