It has shown that less 1, 2-unit content corresponds to lower potential barrier of internal rotation and hence to lower energy of rotational isomerization.
进一步的研究表明，低1，2-链节含量对应着较低的分子链内旋转势垒和内旋转异构化能。
2
Turret punching unit with four-mode vertical position, the whole barrier-free turntable, good view, use without the frequent replacement of mold, improve work efficiency.
冲孔单元采用立式转塔四模位，无障碍整体转盘，视线好，使用时不用频繁的更换模具，提高了工作效率。
3
We observed the structural change of nerve unit and blood-brain barrier by the electron microscope.