常用COD的测定方法有哪些？_爱下问搜题

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问题问答题简答题

常用COD的测定方法有哪些？

答案

参考答案：

常用的测定方法有重铬酸钾法（简称铬法）和高锰酸钾法（简称高锰酸盐指数法）高锰酸钾法还有酸性法和碱性法之分

单项选择题 A1/A2型题

深二度烧伤的损伤深度至（）。

A.表皮角质层

B.表皮颗粒层

C.肌肉层

D.真皮深层，有附件残留

E.皮下

完形填空

I shall never forget the day when the earthquake took place. It was about 5 o’clock in the afternoon and I was 26 to my daughter’s school. Our plan was to go 27 together. I’d stopped at a 28 to get some fresh fruit. We like to have some fruit to eat 29 our swim. I was driving along a high road on the way. 30 my road was another road which was built like a 31 . I was hungry so I put the bag of apples 32 me and started to eat one. 33 I saw the cars in front of me start to 34 from side to side. Then my car started to shake! I didn’t know what was happening. Perhaps something had 35 wrong with my car. I drove a little more slowly and then I 36 the car and at the same moment the road 37 onto the cars in front of me. I found myself in the __38 . I couldn’t move. My legs and feet were hurting badly and I couldn’t move them. All round me was 39 But above me I could hear shouts and a lot of noise. Then I memorized what had happened. I had been 40 an earthquake. For about two hours nobody came. Luckily I could reach the bag of 41 , so at least I had plenty to eat. Then I heard people 42 towards me. A team of people had come to 43 if anyone was under the 44 road. I called out, “I’m here!” I heard a shout. Soon a stranger climbed to my car. “How are you 45 ?”He asked. “Not too bad,”I said. They didn’t get me out until the next morning.

小题2: A. shopping B. dancing C. swimming Dsightseeing

小题8:A. Finally B. Actually C. Suddenly DSlowly