A.2100B.1900C.2000D.2400
A.長(zhǎng)邊比短邊大2倍 B.長(zhǎng)邊比短邊大3倍 C.長(zhǎng)邊與短邊之比大于2 D.長(zhǎng)邊與短邊之比大于3
A.C7.5 B.C20 C.C15 D.C25