A.基本支護、點柱支護、加強支護、切頂柱 B.基本支護、臨時支護、切頂支護、加強支護 C.支架支護、臨時支護、切頂支護、密柱支護
A.250mm B.200mm C.150mm
A.93%-95% B.95%-97% C.97%-99%