A.不應(yīng)小于400mm B.不應(yīng)大于400mm C.不應(yīng)小于500mm D.不應(yīng)大于500mm
A.五 B.四 C.六 D.七
A.0.5L/m2 B.1L/m2 C.1.5L/m2 D.2L/m2