A.1.5~2 B.2.5~3 C.4 D.5
A.1倍 B.1.5倍 C.2倍 D.3倍
A.1節(jié)鏈長(zhǎng) B.2節(jié)鏈長(zhǎng) C.2節(jié)鏈長(zhǎng) D.4節(jié)鏈長(zhǎng)