汽油吸附脱硫反应器顶部安装伞帽的作用是()。
A.降低过滤器负荷
B.降低过滤器固体颗粒携带
C.提高过滤器过滤效率
D.降低反吹阀工作强度
参考答案:A, B, D
During the day,a vessel picking up a submarine cable shall carry().
A.three shapes,the highest and lowest shall be red balls,and the middle shall be a white diamond
B.two black balls
C.three shapes; the highest and lowest shall be black balls,and the middle shall be a red diamond
D.three shapes; the highest and lowest shall be black balls and the middle shall be a black diamond
正常情况下,己内酰胺萃取塔的转盘转速主要由残液中己内酰胺的含量决定,再视萃取塔的负荷大小作适当调节。