A.L2/L1<2 B.L2/L1>2 C.2<L2/L1<3 D.L2/L1>3
A.L2/L1≤2 B.L2/L1<3 C.2<L2/L1<3 D.L2/L1<2
A.短邊 B.長(zhǎng)邊 C.垂直于墻邊 D.短邊及長(zhǎng)邊