简述用《水质梯恩梯、黑索金、地转梯的测定气相色谱法》（GB/T13_爱下问搜题

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问题问答题简答题

简述用《水质梯恩梯、黑索金、地转梯的测定气相色谱法》（GB/T13904-1992）测定地恩梯时，地恩梯内标校正曲线的绘制过程。

答案

参考答案：用地恩梯标准贮备液配制成线性范围内的系列标准溶液，定量加入内标物程序萃取，定量注入谱仪测定。以被测物与内标物峰面积（或峰高）之比为纵坐标，地恩梯标准浓度为横坐标，绘制其内标曲线。

多项选择题

下列哪种焊接方式适用于薄板焊接（）。

A．气焊

B．埋弧焊

C．CO气体保护焊

D．钨极惰性气体保护焊

完形填空

The little boy turned to the old woman next to him, ‘‘Granny, are you sure I don’t have enough money?’’ She nodded. The little boy was still   36  the doll (洋娃娃) in his hand.
I walked toward him,   37  who he wished to give this doll to. “Sister. She was sure that Santa Claus would bring a doll to her.” I told him that maybe Santa Claus would do so. But he replied to me   38  . “No, Santa Claus(圣诞老人) can’t bring it to her   39  she is now. I have to give the doll to my mommy so that she can give it to my sister when she   40  there. My sister has gone to be with God. Daddy says that Mommy is going to see God very soon too,   41  I thought she could take the doll with her to give it to my sister.’’
The little boy looked   42  at me, “I told Daddy to tell Mommy not to go yet. I need her to wait until I come back from the mall. I   43  she didn’t have to leave me, but Daddy says that she has to go to be with my little sister.” Then he looked   44  at the doll with sad eyes.
I quickly   45  for my wallet. “Let’s check again, just in case you do have enough money for the doll!” “OK. I hope I do have enough.” I added some of my money to   46  without him seeing and we started to count it. There was enough for the doll and   47  some spare money. “Thank you God for giving me enough money!” He looked at me and   48 , “I wanted to have enough money to buy a white rose for my Mommy, but I didn’t dare to ask God   49  too much. But He gave me enough to buy the doll and a white rose. My mommy loves white roses.”
50  I remembered a local newspaper article two days ago, mentioning a drunk man in a truck hit a car   51  by a young woman and a little girl. The little girl   52  right away and the mother was   53  in a critical state.
Two days   54  this encounter (偶然相遇) with the little boy, I read in the newspaper that the young   55  had passed away.

A．considering

B．understanding