查询词典 ring

However, the presence of steric hindrance and electron-withdrawing groups on the benzene ring would decrease the activity of phenols.

苯环上有供电子基团的酚类化合物反应活性比较好，而钝化基团的存在，则会降低酚羟基的反应活性。

65 The methyl group on the benzene ring greatly facilitates the nitration of toluene.

苯环上的甲基使甲苯非常易于硝化苯环上的甲基使甲苯非常易于硝化。

Our results suggest that the chemical structure and number of hydroxyl groups on the benzene ring of coumarin were correlated with the effects of ROS suppression.

结果发现所有的香豆素衍生物都具有抑制黄嘌呤氧化酶活性的能力，且其抑制型态属於竞争型抑制剂。

The results show that the Zn complex can be partially intercalated into the double helix of DNA due to the planarity of the benzimidazole ring and the bulky structure of the complex.

实验结果表明，由于配合物的八面体构型以及苯并咪唑环的平面性，其与DNA作用方式可能为部分插入。

Oil and benzine, O-ring at long connection thread

腐蚀。在螺纹连接体上带有O 型垫圈。

The trifluoromethyl modified benzofuran compounds synthesized by the invention contain a plurality of functional groups in benzene ring portion, and can be used as precursor for subsequent synthesis of benzofuran medicine intermediate containing trifluoromethyl.

本发明合成的三氟甲基修饰的苯并呋喃类化合物，苯环部分包括多种官能团，可以作为后续合成含三氟甲基苯并呋喃药物中间体的前体。

The effects of preheating on temperature and stress fields of beryllium ring during laser brazing process were studied.

研究预热对铍环激光束钎焊过程温度场和应力场分布的影响。

If you want a truly bespoke engagement ring, talk to Daniel.

如果你想预订一个真正接触戒指，跟丹尼尔。

This kind of ring is one of our best-selling items .

这种戒指是销售最好的商品之一。

The large ring to the right of Betelgeuse is the remnant of a supernova explosion, centered around the star Lambda Orionis.

围绕在λ星四周，在α星右侧的大光环是一颗超新星的爆炸残余物。

You'd think after he sold his fancy dot-com company , he'd remember his old man !

等着瞧吧，等他把他那花里胡哨的网上公司卖了后他就会记得我这个老家伙了！

But there are other sounds those monitors pick up as well, for instance those of waves and choppy waters.

但是，这些监测仪也同时记录下其它的声音，比如波浪和不平静水面的声音。