A.1倍鋼筋直徑長(zhǎng)度 B.1.5倍鋼筋直徑長(zhǎng)度 C.2倍鋼筋直徑長(zhǎng)度 D.2.5倍鋼筋直徑長(zhǎng)度
A.1 B.3 C.2 D.4
A.80mm B.50mm C.100mm D.20mm