A.搭接長(zhǎng)度0.5m,用2個(gè)旋轉(zhuǎn)扣件; B.搭接長(zhǎng)度0.5m,用3個(gè)旋轉(zhuǎn)扣件; C.搭接長(zhǎng)度1.0m,用2個(gè)旋轉(zhuǎn)扣件; D.搭接長(zhǎng)度1.0m,用3個(gè)旋轉(zhuǎn)扣件。
A.27 B.35 C.40 D.45
A.2.8 B.3.0 C.3.2 D.4.0