Structural Fireman
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一定要用cantilever structures / hanging structure去避開 咁就成功distinct左
提你一個scheme做transfer
另一個就直上直落
極為仁慈既column spacing requirement
提晒一個做極細column spacing
而另一個scheme做大column spacing
咁又成功distinct左
呢個point應該係陷阱位
意思係指條sewer上面(L1)
唔可以掘超過300
即係指我地個部份既L1
Structural Zone只有300!