They hold the helmet by the "D" ring and can be adjusted to fit any style helmet with a "D" ring.
通过D形环支撑头盔，而且可进行调整以适合任何样式的头盔。
It holds the helmet by the "d" ring and can be adjusted to fit any style helmet with a "d" ring.
通过D形环支撑头盔，而且可进行调整以适合任何样式的头盔。
The Ring-opening polymerization(ROP) of D-lactide(D-LA) catalyzed by bifunctional thiourea catalyst has been studied by performing density functional theory calculations at the B3LYP/6-31G(d) level.
用密度泛函理论在B3LYP/6-31G（d）水平上研究了双官能团硫脲催化丙交酯开环聚合反应的微观机理。
The Ring-opening polymerization(ROP) of D-lactide(D-LA) catalyzed by bifunctional thiourea catalyst has been studied by performing density functional theory calculations at the B3LYP/6-31G(d) level.
用密度泛函理论在B3LYP/6-31G（d）水平上研究了双官能团硫脲催化丙交酯开环聚合反应的微观机理。
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