请问:L-1(+0.900)上 (-0.500)下,

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请问:L-1(+0.900)上(-0.500)下,请问:L-1(+0.900)上(-0.500)下,请问:L-1(+0.900)上(-0.500)下,L-1是梁编号,分上下两道梁,(+0.900)是上

请问:L-1(+0.900)上 (-0.500)下,
请问:L-1(+0.900)上 (-0.500)下,

请问:L-1(+0.900)上 (-0.500)下,
L-1是梁编号,分上下两道梁,(+0.900)是上部梁标高+0.900,(-0.500)是下部梁,标高是-0.500.