问题
单项选择题
根据《生物样品灰中铯．137的放射化学分析方法》（GB／T11221—1989），每当更换试剂时必须进行空白试验，试样数不得少于（）个
A.2
B.4
C.6
D.8
答案
参考答案：B
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根据《生物样品灰中铯．137的放射化学分析方法》（GB／T11221—1989），每当更换试剂时必须进行空白试验，试样数不得少于（）个
A.2
B.4
C.6
D.8
参考答案：B
I worked for a short time as a waiter at a a few months ago. I also helped to clean up the tables when it was very . One night, just before Christmas, I found a large black wallet the floor near one of the tables. I guessed I should check it to find out was the owner, but I was very busy at the time. And I imagined that there was something valuable in the wallet, the owner would be back. Sure enough, an hour a man came up to the counter and asked if anyone had found a wallet. I him to describe the lost wallet, and after he described it exactly, I gave him the wallet. He expressed his . He asked me if I had opened , and when I told him “no”. At once he opened it showed that it had nearly $ 800 in cash. He took out a twenty-dollar bill and it to me and I was amazed at this. Thinking about it later, I began wondering whether I would have been if I had known what was in the wallet! I thought that if I had no way to the owner and no one returned to get it, I might keep it. But it also came into my that I actually saved someone’s Christmas plans by finding and returning the wallet. The good feeling it gave me was worth more than we could buy with money.
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