中等环

词组短语

middle ring

与中等环相关的网络例句 [注：此内容来源于网络，仅供参考]

Various alcohols are tolerable under the present conditions including benzylic alcohols,allylic alcohols as well as simple aliphatic alcohols.

醇的范围非常广，二苯甲醇、1-苯乙醇、烯丙醇衍生物等含苄醇结构的地物能够以最高接近定量的产率得到产物。普通烷基醇如环己醇，甚至最简单的甲醇和乙醇也能顺利反应，产率中等。

Various alcohols are tolerable under the present conditions including benzylic alcohols,allylic alcohols as well as simple aliphatic alcohols.

普通烷基醇如环己醇，甚至最简单的甲醇和乙醇也能顺利反应，产率中等。在这个反应中，磷钨酸能够顺利回收，并在此被用于催化反应，活性没有降低。

Priority PAHs recommended by USEPA were all detected, and the mass concentrations of individual PAHs was between 1.49 and 87.43ngg^(-1), The PAHs with low molecular weight, such as Nap, Flu, Ace were observed in relatively low mass concentrations. The PAHs with high molecular weight, such as Chrysene, Indeno [1, 2, 3-cd] pyrene, Benzo perylene were relatively abundant and the mass congcentration of BghiP was the highest. The total mass congcentration of 16 PAHs exceeded standard of Holand from 10 to 40 times, and in middle pollution level comparatively with other districts.

美国环保总署推荐优先控制的16种多环芳烃均被检出，多环芳烃单体的质量浓度在1.49~87.43ngg^(-1)扩之间；其中萘、药、苊等低分子量芳烃的质量浓度相对较低；窟、茚并[1， 2， 3-cd]苝、苯并苝等高分子量芳烃的质量浓度相对较高，苯并苝的质量浓度最高。16种多环芳烃的质量总浓度超过荷兰政府规定无污染土壤PAHs值的10~40倍；与国内外其他地区相比较，多环芳烃污染处于中等水平。

The condensation of aromatic aldehydes with active methylene compounds like malononitrile, cyanoacetamide and ethyl cyanoacetate has been found to proceed very efficiently at room temperature giving excellent yields, but the condensation of heteroaromatic,α,β-unsaturated and aliphatic aldehydes with active methylene compounds proceeded smoothly in 50~65℃ with good yields and the reactions of aromatic, aliphatic ketones as well as p-phthalaldehyde with malononitrile also proceeded in 75~85℃ with moderate yields.

芳香醛与活泼亚甲基化合物如丙二腈、氰基乙酸乙酯、氰基乙酰胺的缩合在室温下即能顺利进行，获得了很高的收率；而对于杂环芳醛、α，β-不饱和的醛以及脂肪醛与活泼亚甲基化合物的缩合，需在50~65℃下进行，也取得了很高的收率；对于脂肪酮、芳香酮以及二元醛与丙二腈的缩合在75~85℃下也能顺利地进行，获得中等以上的收率。

Twelve tumors were solid and three contained cystic components. Nine were inhomogeneously hypoechoic. Two were homogeneously hypoechoic. Two were inhomogeneously isoechoic. Two were homogeneously isoechoic. Two contained microcalcification. One with acoustic shadowing. Twelve were well-defined and three were ill-defined. Fourteen were regular and one was irregular. Four had acoustic halo. Six were ecstatic. Nine were not ecstatic. Thirteen were examined with color Doppler ultrasound. Nine had abundent branched blood flow within the tumor and ring blood flow around. Two had short linear blood flow within the tumor and ring flow around.

不均质低回声9个，均匀低回声2个，不均质中等回声2个，均匀中等回声2个。2个肿瘤内见细小钙化斑，1个伴声衰减。12个肿瘤边界清，3个边界欠清。14个肿瘤形态规则，1个形态不规则。4个肿瘤伴&晕环征&。6个肿瘤有膨胀感，9个肿瘤无明显膨胀感。13个肿瘤行彩色超声检查，9个内部见丰富分枝状血流，周边见环状血流，2个内部见短线状血流，周边环状，仅2个内部无彩色血流，周边见点状彩色血流。

In the last part we first synthesized the propargylic amines though several methods and then developed a new methodology for the synthesis of -α-chloroalkylidene-β-lactams via the catalysis of PdCl〓 with CuCl〓 and BQ with moderate to good yields and good generality.

论文的第三部分工作是我们首先通过几种方法合成了炔丙基胺化合物，接着对PdCl〓催化的炔丙基胺的羰基插入环化反应进行了研究，以中等收率得到-α-氯代亚烷基-β-内酰胺化合物，反应的普适性良好。

The results showed that Kaidimycin was chemically neutral, macrocylic polylactones, stable and liable to dissolve into water and pyridine, slight to dissolve into methanol, ethanol and N-butanol, difficult to dissolve into ethyl acetate, acetone, benzene and chloroform. Chemical reaction of functional group of Kaidimycin showed that it had glycoside, amino acid and aldehyde, no reducing sugar, polypeptide and phenol.

凯地菌素属中等极性的、中性抗生素，极性纸层析结果与多烯类抗生素的纸层析结果相似：易溶于水、吡啶，微溶于甲醇、乙醇、正丁醇，不溶于乙酸乙酯、丙酮、苯、三氯化碳；对高温、光照和紫外处理有很好的稳定性；官能团反应试验结果发现，凯地菌素可能含有糖苷键、氨基酸伯氨基和醛基，不含有还原糖、多肽和酚基，高锰酸钾、浓硫酸反应与多烯大环内酯类抗生素的特性相似；并且依据纯品，采用生物法和分光光度法对摇床发酵液进行了效价的测定。

Chiral SalanCrX complexesa saturated version of SalenCr(ⅢX are designed,and in conjunction with an ionic quaternary ammonium salt or organic strong base can efficiently catalyze the asymmetric,regio-and stereoselective alternating copolymerization of CO_2 with rac-PO at mild conditions to afford isotactic-enriched polycarbonates with～95%head-to-tail linkages and moderate enantioselectivity.

本论文在Salen构型配体的基础上，设计合成了一系列手性Salan型铬配合物，并将其与季铵盐/有机强碱组成亲电-亲核双组分催化体系，在室温下可以有效的催化CO_2和环氧丙烷的不对称交替共聚反应，实现了CO_2和环氧丙烷的不对称交替共聚反应的区域和立体化学控制，得到95%的头尾连接单元和中等光学纯度(对映体过量值ee%≈70%)的全同结构的聚碳酸酯。

Construction of the Graf Zeppelin in Friedrichshafen: the lower and middle gangways are highlighted green with main rings in red; two people are shown in yellow.

建设格拉夫齐柏林飞艇在腓特烈：中等和低过道突出绿色与主环红；两个人显示为黄色。

Apart from small populations in Hualien, Taitung, Tainan and Taichung counties, Formosan ring-necked pheasants have now all but disappeared from the island.

台湾地区除了花莲、台东、台南和台中等地，还有几个小族群外，其他地区已经很难发现「台湾环类雉」的踪迹了！