ring distribution system的意思|示意

Polytetrahydrofuran (PTHF) with narrow molecular mass distribution was prepared by cationic ring-opening polymerization of tetrahydrofuran using H_2SO_4 · SO_3-HClO_4 system as a catalyst.

以发烟硫酸-高氯酸为催化剂，通过四氢呋喃的阳离子开环聚合合成了窄分子量分布的聚四氢呋喃(PTHF)。

Planetary scientists will be studying ring images taken near equinox to help better understand the dynamics and particle size distribution of the Solar system's most extensive ring system.

未来行星颗学家会持续研究春分点前后的影像，进而了解这个太阳系内拥有最大行星环的行星，动力成因与粒子分布特征。