A.1/2樁徑或邊長(zhǎng) B.1/3樁徑或邊長(zhǎng) C.1/4樁徑 D.1/3邊長(zhǎng)
A.最低高程300mm B.最低高程500mm C.最高高程300mm D.最高高程500mm
A.16mm B.12mm C.10mm D.6mm