A.20 B.15 C.10 D.5
A.8 B.6 C.4 D.2
A.1.5×接續(xù)長(zhǎng)度 B.1.3×接續(xù)長(zhǎng)度 C.1.2×接續(xù)長(zhǎng)度 D.1.0×接續(xù)長(zhǎng)度