简述混合离子交换器本体上的上、中、下三个窥视镜的作用。_爱下问搜题

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问题问答题简答题

简述混合离子交换器本体上的上、中、下三个窥视镜的作用。

答案

参考答案：①上部窥视镜作混合离子交换器再生时，观察离子交换树脂反洗分层时树脂上表面的位置，以防离子交换树脂流失；

②中部窥视镜作观察混合离子交换器内离子交换树脂的装填高度；

③下部窥视镜作观察混合离子交换器再生时离子交换树脂反洗分层后的分层效果。

完形填空

Instroduction to Letters to Sam
Dear Reader，
Please allow me to tell you something before you read this book. When my 36 ,Sam, was born, my heart was filled with joy. I had been sitting in a wheelchair for 20 years before then,and I have been 37 ill many times.So I wonderfuled if would have the 38 to tell Sam what I had 39 .
For years I have been hosting a program on the 40 and writing articles for a magazine.Being 41 to move freely,I have learned to sit still and keep my heart 42 , exchanging thoughts with thousands of listeners and 43 . So when Sam was born ,I 44 to tell him about school and friendship,Romance and work,Love and everything else. That’s how I started to write these 45 . I hoped that Sam would 46 them sooner or later.
However,that expedition 47 when Sam showed signs of autism(自闭症)at the age of two.He had actually stopped talking before the discovery of the signs.He 48 to communicate with others,even the family members.That was 49 for me but didn’t stop me writing on.I realized that I had even 50 now to tell him.I wanted him to 51 what it means to be “different ”from others,and learn how to fight against the misfortune he’ll 52 as I myself,his grandfather,did. I just 53 if I could write all that I wanted to say in the rest of my life.
Now, 54 the book has been published,I have been given the chance.Every chapter in the book is a letter to Sam:some about my life,and all about what it means to be a 55 .
Daniel GOttliebe

D．responsibility

B．disappeared

D．heartbreaking

问答题简答题

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