... 基因置换;gene substitution 环取代;ring substitution 直接代入法;direct substitution ...
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环取代的 cyclosubstituted
环取代聚苯胺 ring substituted polyaniline
吩噻嗪侧环取代衍生物 Phenothiazine derivatives substituted on lateral rings
环上取代 ring substitution
环上取代作用 ring substitution
取代环 displacement loop
苯环上的亲电取代反应 Electrophilic substitution reactions of benzene
烷基取代的环状磷腈 HECP
取代环戊酮 Substituted cyclopentanone
它以铜环取代了银环，测试效果完全可靠，并大大降低了集电器的制造成本。
With copper ring instead of silver ring, this collector is fully reliable for measurement and able to largely reduce its manufacture cost.
实验结果表明：焦炭前身物主要由三环取代芳香化合物组成，并有芳醚类化合物存在。
It was found that the coke precursor was mainly three ring aromatic compounds with a few of aromatic ethers.
值得注意的是， 这种糖片段上有芳环取代的烷酰氧基基团的麦角甾烷型甾体糖苷为真菌中首次报道。
It is worth while to note that the steroidal glycoside possessing an aromatic ring substituted alkanoyl group at its glucose moiety was found for the first time in fungi .
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