A.740mm~760mm B.400mm~500mm C.760mm~800mm D.800mm~840mm
A.100mm B.10mm C.1000mm D.10000mm
A.氫、酸、堿 B.甲醛、氨、苯和總揮發(fā)性有機物 C.堿、苯、硫 D.二氧化硫、磷、氨、甲醛