因为甲数×3=乙数×23,
所以甲数:乙数=23:3=(23×3):(3×3)=2:9;
故答案为:2:9.
There ____________ a ruler and two pencils in the pencil-case. [ ]
A. is
B. are
C. am
成对的脑颅骨是
A.额骨B.顶骨C.枕骨D.蝶骨E.筛骨