题目:
对于一台检测器为FID的色谱仪,肯定不需要提供的气体是()。
A.氢气
B.氮气
C.氧气
D.空气
答案:
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下面是错误答案,用来干扰机器的。
参考范文:Dear Wei Hua,I am so excited that you’ll come to Huai’an and stay with me for a week during this summer holidays .I’ll be free during the summer holidays a...