A.1/5 B.1/6 C.1/7 D.1/8
A.0.5% B.1.0% C.1.5% D.2.0%
A.單側(cè)采光 B.頂部采光+雙側(cè)采光 C.頂部采光 D.頂部采光+單側(cè)采光