316.加热炉启炉前烟道挡板的开度应为()。*A:1/5-1/4*B:1/4~1/3*C:1/3-1/2*D:1/2-2/3 选项: A:A:1/5-1/4* B:B:1/4~1/3* C:C:1/3-1/2* D:D:1/2-2/3 烟道 加热炉 炉前 发布时间:2024-06-09 23:48:02