【单选题】I had no idea she was there. I met her only____. [ ]
【单选题】—I think Mr Zhang may be in his office. —No, he be there. I saw him just now.
【判断题】色谱分析中,色谱柱温度不能高于固定液的最高使用温度。
【单选题】在下列关于气相色谱分析中如何选择柱温的最佳操作条件的叙述中错误的是()。
A.
一般选用柱温的原则是在被分析物质组分的平均沸点左右或稍低一点为佳
【简答题】阅读理解。 Last Sunday, I went to the park with my parents. There were many people there. I saw some boys and girls. They sang. Some English songs. Who was the boy in green? He was David. He played footbal...
【判断题】气相色谱柱的柱温不能高于固定液的最高使用温度,否则固定液挥发流失。
【简答题】VI、阅读短文,并根据短文将句子补充完整。 Last summer, I went to Taiwan with my parents. I went to see Sun Moon Lake. The lake was very beautiful. There were many people there. I took many photos on my mobile. The fruits...