醚

Moreover, signals characteristic of the crown ether at d=3.72 and 3.82 ppm in four-arm PCL20–DB24C8 (Figure 1b) shifted upfield to the range of d=3.4–3.8 ppm (Figure 1c).

此外，信号特征冠醚为D = 3.72 并在百万分之3.82四臂 PCL20 - DB24C8（图1b）转向高场的范围= 3月4日至3月八日百万（图1c）。

It also has a leather and suede upper, shiny PPG accents and a perforated vamp and tongue.

它还有一个皮革和小山羊皮上，闪亮的聚醚口音和穿孔鞋面和舌头。

Uranyl ion is coordinated with two water molecules and it is independent of the concentration of nitric acid.

对于C_(H_2o)/C_uo_2~(2+值较大的情况，用六甲基二硅醚为内标物测定水合数。

Saturated urushiol crown ether ; lead ion ; ionselective electrode

饱和漆酚冠醚；铅离子；离子选择电极

These results suggest that the inhibitoryeffect of sevoflurane on Ang II-induced vasoconstriction is,at least in part, caused by the inhibition of the p44/42 MAPK-mediatedsignaling pathway.

这一结果表明：七氟醚对於血管紧张素 II 介导的血管收缩的抑制作用，至少部分是由於对 p44/42 MAPK 介导的信号通道的抑制引起。

A biodegradable polyurethane foam from liquefied polyol was successfully prepared by using water as vesicant in one step method.

其次，以液化多元醇代替部分聚醚多元醇，采用一步法制备了以水为发泡剂具有良好性能的环境友好可降解聚氨酯包装用泡沫塑料。

G. the perfumes. The wall forming materials were TDI (2, 4-toluene diisocyanate) or 80/20TDI, triphenyl methane triisocyanate and biphenyl methane-4, 4-diisocyanate , Poly vinyl alcohol was used as protective colloid and GPE2040 was used as the emulsifier.

壁材单体分别使用了2，4-甲苯二异氰酸酯、80／20-甲苯二异氰酸酯、三苯基甲烷-4，4′，4-三异氰酸酯和二苯甲烷-4，4′-二异氰酸酯；保护胶体是聚乙烯醇；乳化剂是聚醚2040；催化剂使用二月桂酸二丁基锡。

1H NMR spectroscopy, viscometry, and differential scanning calorimetry were employed to characterize this novel type of crown ether-based supramolecular network

我们用氢核磁共振光谱法、粘度测定法和差示扫描量热法来表征这一类新的冠醚基超分子网络。

The effects of hard segment content on the microstructure and viscosity of polyether PU and PUU were studied by FT-IR, DSC, viscosimeter.

利用FT-IR，DSC，旋转黏度计研究了硬段含量对聚醚型PU和PUU的微观结构及黏度的影响。

The levels of PBDEs in water snake, fish, prawn and Chinese mysterysnail ranged 39.6~186, 1.82~75.7, 4.60~17.1 and 7.26~17.0μg·g-1, respectively.

为调查电子垃圾回收活动对当地水生生物造成的多溴联苯醚污染，测定了广东某电子垃圾回收地附近水库中水生生物样品（水蛇、鱼类、草虾和田螺）和对照区样品中18种PBDEs含量，通过对样品氮同位素的测定，探讨了PBDEs在该地淡水食物链上的生物富集特征。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。