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- The mechanism of the ring enlarging reaction,sorts of ring enlarging catalysts and several preparative methods of converting 7 (phenylacetamido) deacetoxycephalosporin acid to 7 ADCA were summarised. 总结了扩环反应的反应机理、扩环催化剂的种类及由头孢烷酸转化成7-ADCA的方法。
- She had the sapphire set in a gold ring. 她把那枚蓝宝石镶在金戒指上了。
- The diamond ring dazzled with brilliancy. 这只钻石戒指闪耀夺目。
- The enlargement brings out the details in the photograph. 照片放大后细微之处都很清楚。
- She wears a diamond ring on her left hand. 她左手上戴着一枚钻石戒指。
- Our family reunions are always three ring circus. 我家合家团聚的场面总是热闹非凡。
- Abnormal enlargement of the breasts in a male. 男子女性型乳房男性胸部的异常增大
- I am sorry-she's out. Can you ring again later? 对不起－她出去了。你过些时候再打电话来好吗？
- The boys and girls made a ring round us. 男孩和女孩围着我们站了一圈。
- Please ring for the attendant if you need anything. 如果需要什么，请按铃找服务员。
- The music was so loud it made my ears ring. 音乐的声音太大了，把我耳朵震得直响。
- The policeman felt that my story didn't ring true. 警察认为我讲的话听起来不可信。
- I'm sending mother an enlargement of the baby's photo. 我给母亲寄张小宝宝的放大的照片。
- She wears a ring round her wrist. 她的手腕上戴着一只镯子。
- Ring the correct answer with your pencil. 用铅笔圈出正确的答案。
- A pull on the rope will make the bell ring. 一拉绳子钟就响。
- aminodesacetoxy cephalosproanic acid (7-ADCA) is made from penicillin G via oxidation, ring enlargement rearrangement and fragmentation. 氨基-3-去乙酰氧基头孢烷酸(7-ADCA)是以青霉素G为原料,经氧化、扩环重排、裂解3步反应制得。
- He have scarcely get home when the telephone ring. 他一回到家电话铃就响了起来。
- I'll ring you up some time during the week. 本周的某个时候我给你打电话。
- The jeweller will engrave the inside of the ring with her name. 珠宝匠将在戒指的内表面上刻上她的名字。
