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脱硫塔出口H2S偏高如何处理?


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考题 设字符串S1= “ABCDEF”,S2= “PQRS”,则运算S=CONCAT(SUB(S1,2,LEN(S2)),SUB(S1,LEN(S2),2))后的串值为()。

考题 s=”this is the mainstring”,sub=”string”,strindex(s,sub)是()

考题 脱硫塔出口H2S指标高,如何处理?

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考题 问答题脱硫塔出口H2S指标高,如何处理?

考题 问答题脱硫塔出口H2S偏高如何处理?

考题 填空题s=”this is the mainstring”,sub=”string”,strindex(s,sub)是()

考题 填空题设字符串S1= “ABCDEF”,S2= “PQRS”,则运算S=CONCAT(SUB(S1,2,LEN(S2)),SUB(S1,LEN(S2),2))后的串值为()。