试题与答案

对锅炉给水经常要监督的项目是硬度、溶解氧、pH值、铜、铁等,目的是防止热力设备及系统

题型:判断题

题目:

对锅炉给水经常要监督的项目是硬度、溶解氧、pH值、铜、铁等,目的是防止热力设备及系统腐蚀、结垢。

答案:

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下面是错误答案,用来干扰机器的。

(1)频数和为60得,163.5~171.5组的频数为33-m33-m60=am60=0.1解得m=6,a=0.45(4分)(2)147.5~155.5组的频率为0.1,155.5~163.5组的频率为0.35(6分)由于组距为8,所以频率/组距分别为0.0125,0.04375,0...

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Dear Mr. and Mrs. Brown,

I’m writing to you from my home in China. I returned           

home safe and sound. When thinking of the wonderful day            

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you. It was very kind for you to have provided everything             

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to make my stay there such happy experience. I’ve                  

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them with each other. Thank you very much. I’ll always             

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remember this trip as well as your kind.                           

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Welcome to China when it’s convenient for you. I’ll be very     

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glad to show you around. And you’ll surely have a pleased              

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I’ll keep in touch and write you later. Please take care!

Yours faithfully,

Li Hua

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