RESULTS: The two novel D ring synthons are of high optical purity.
结果：所合成的两个手性d环合成子光学纯度高。
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 torus curve triangular BEM is put forward to calculate electric field intensity of ring electrodes in 3-d electrostatic fields.
针对高压电力设备中常见的圆环电极表面电场强度的计算问题，提出了圆环面曲边三角形边界元方法。
The resulted D, L-lactide and glycolide were found to have ring structure by fourier transform infrared spectrometry and proton nuclear magnetic resonance(1H NMR) spectrometry.
通过傅立叶红外光谱和氢核磁谱（1H NMR）测试表明所合成的丙交酯和乙交酯具有环状结构。
Taking Shanghai Middle Ring Road project as example, the principle and effect of D-125 as a waterproof agent are described.
并以上海中环线工程为例，介绍了D-125有机硅浸渍防水剂的防水原理和防水效果。
Record of Drought and Flood Series by Tree-Ring Data in the Middle Section of Qilian Mountain Since 904 A. D.
祁连山中部公元904年以来树木年轮记录的旱涝变化。
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。
A non-clock delay-ring A/D converter is presented, which is based on standard cell library and not sensitive to process variation.
提出了一种无需外部时钟、可以部分抵消工艺偏差、基于标准单元的延迟环A/D变换器。
This article introduces the ultimate principle and calculation method technique of 1-d smoke ring inversion technique for grounded source transient electromagnetic method and the applied examples.
文中给出电性源瞬变电磁测深一维“烟圈”反演解释方法的基本原理、计算方法和应用实例。
We "d best get to that hotel before they ring down the curtain on the conference."
我们最好能在会议结束之前赶到那家酒店。
We "d best get to that hotel before they ring down the curtain on the conference."
我们最好能在会议结束之前赶到那家酒店。
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