当最后一级克劳斯反应器出口分析含COS高时,应该()。
A.降低气风比
B.降低反应温度
C.提高反应器温度
D.降低反应器温度
参考答案:C
There were some seats left over _____every delegate had sat down.
A.when
B.until
C.that
D.where
CO2气瓶使用CO2,气体电热预热器时,其电压应采用( )V。
A.36
B.48
C.60
D.90