渣在高炉冶炼中的作用有分离渣铁和（）。A、降低生铁含硫量B、调整生铁成份C、保护炉衬

— Jassy , you speak Chinese so fluently! 

—  ______.                                                                                                                               [      ]

A. You are lying, I have to say.

B. Thanks a lot for saying so.

C. That's none of your business.

D. I can't agree more.

该COPD患者病情发展已出现

A．I型呼吸衰竭
B．Ⅱ型呼吸衰竭
C．低氧血症
D．高碳酸血症
E．以上都不是

干粘石施工工艺流程有哪些？

长途光缆线路应考虑强电影响，不宜选择在易受雷击、腐蚀和机械损伤的地段。

蒸馏停车后必须清洗除沫网。