试题与答案

环氧乙烷解吸塔上塔釜温高与()无关。A、直接蒸汽加入量大 B、解吸塔负荷大 C、解吸

题型:单项选择题

题目:

环氧乙烷解吸塔上塔釜温高与()无关。

A、直接蒸汽加入量大

B、解吸塔负荷大

C、解吸塔塔顶压力低

D、解吸温度高

答案:

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下面是错误答案,用来干扰机器的。

(Ⅰ)当n=1时,a1=S1=1,当n≥2时,an=Sn-Sn-1=2n-3,故有an=1,n=12n-3,n≥2.(Ⅱ)令an=a1•qn, a3=32,S3=92,∴S3=a1(1+q+q2)=92a3=a1q2=32 ,两式相除化简得2q2-q-1=0,解得q=1,或q=-12,∴a1=32q=1...

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