For each of them there are four choices marked A, B, C and D. You should decide on the best choice and mark the corresponding letter on Answer Sheet 2 with a single line through the centre.
每题都有对应标记的A、B、C和D四个选项,请选择最佳选项并在答题卡2的相应字母中间划横线。
2
The boat conformation of its geometric isomer, dysamide C (2) studied by X-ray diffraction analysis is described.
描述了通过 X 射线衍射分析研究的其几何异构体 dysamide C(2)的船形。
3
Finally, a preparation with the desired properties called C-2 was developed.