A.樁長(zhǎng)的1/3 B.樁長(zhǎng)的1/2 C.樁長(zhǎng)的2/3 D.樁長(zhǎng)的3/4
A.1/3樁長(zhǎng) B.1/2樁長(zhǎng) C.2/3樁長(zhǎng) D.3/5樁長(zhǎng)
A.≥30mm B.≥40mm C.≥50mm D.≥60mm