醚的

A method for the determination of polybrominated diphenyl ethers in pine needles was developed.

建立了测定松针样品中多溴联苯醚的分析方法。

You can also visit the Woodland Magic Shop to purchase upgrades to these ethereal powers.

您也可以访问林地魔术店购买升级到这些醚的权力。

It was found when ionic liquid BF_4 was chosen for the solvent and CsF for the fluorination reagent, the overall yield 96.6% could be gotten after 3 hours.

通过研究我们发现在离子液体BF_4中，采用CsF做氟化剂反应3小时七氟醚的产率可以达到96.6％。

Photochemical degradation is one of the important fates for PBDEs in natural environment.

光化学降解是环境中多溴联苯醚的重要归趋之一。

Rubidium and rhenium in rock samples are satisfactorily determined by neutron activation method.

冠醚的选择性定量溶剂萃取已较好地应用于中子活化分析岩石中微量Rb和Re。

The bulk and solution photopolymerization of vinyl butyl ether were studied using diph-enyl-4-thiophenoxyphenyl sulfonium salt as photoinitiator.

以二苯基-4-苯硫基代苯基硫鎓盐为光引发剂，研究了乙烯基正丁醚的本体和溶液光聚合。

Results: Fifty-two constituents were isolated from Acorns tatarinowii schott in essential oils and thirty-mine compounds were determined, the content of β-asarone is 83.75%.

结果：从石菖蒲挥发油中共分离出52种成分，鉴定了39种化合物，其中β-细辛醚的含量占了83.75%。

The OH functionality of the polyether may be controlled by using modifiers such as glycidol, ethylene glycol, water or trimethylol propane

用缩水甘油、乙二醇，水或三羟甲基丙烷等改良剂，可控制聚醚的羟基官能团。

The OH functionality of the polyether may be controlled by using modifiers such as glycidol, ethylene glycol, water, or trimethylol propane

可用缩水甘油，乙二醇，水或三羟甲基丙烷等改良剂，可控制聚醚的羟基官能团。

The cis-decalin 79 was obtained from 2-methoxy-4-methylphenol (77) via a sequence of reactions involving intermolecular Diels-Alder reaction of masked o-benzoquinone derived from 77 and ethyl vinyl ketone, silyl enol ether formation and Cope rearrangement.

第一部份：以2-甲氧基-4-甲基酚(77)为起始物，经由二乙醯基亚碘苯氧化、分子间Diels-Alder反应、烯醇矽醚的形成及Cope重排反应得到具有十氢萘骨架化合物79。

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。