There is _____ sheep eating grass there.[ ]
A. a little
B. little
C. a few
D. few
答案:A
若两圆的半径分别为2cm和6cm,圆心距为4cm,则这两圆的位置关系是 [ ]
A.内含
B.内切
C.外切
D.外离
直接埋地电缆埋设深度不应小于0.7m。