如何预防分馏塔冲塔?
参考答案:
1.掌握好物料平衡;
2.焦炭塔换塔或小吹汽时,注意液面变化情况;
3.控制好油汽分离罐油水介面。
If a cargo of kerosene were considered too lean to explode, then it must be().
A.above the explosive range
B.within the explosive range
C.below the explosive range
D.None of the above
下列需要加入抑菌剂的是
A.药物的灭菌粉末
B.固体药物
C.无菌操作法制备的滴眼液
D.静脉注射液
E.脊髓注射液