The vapor phase concentration of durene could be adjusted by the self - made adjustor .

自制的高熔点物料气相浓度调控仪能很好地调控气相中均四甲苯的浓度，具有推广应用价值。

youdao

The vapor phase concentration of durene could be adjusted by the self - made adjustor .

自制的高熔点物料气相浓度调控仪能很好地调控气相中均四甲苯的浓度，具有推广应用价值。

youdao