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- The synthetic route was definited and modified. With7-Amino-3-deacetoxylcephalosporanic acid andD-2-(l,4-hexadienyl)glycine Dane salt as the starting materials, it had been preprared in a five-steps procedure in overall yield of 88.4% (mass yield: 152%). 确定并打通了头孢拉定的合成路线,以7-氨基-3-脱乙酰氧基头孢烷酸(简称7-ADCA)和D-2-(1,4-环己二烯)甘氨酸邓钠盐为起始原料,经五步反应得到头孢拉定,总收率为88.;4%25(重量收率为152%25,以7-ADCA计)。
- We will never yield to invaders. 我们绝不会向侵略者屈服。
- A cloud is a mass of vapor in the sky. 云是天空中的水汽团。
- The mass rally was a total fiasco. 那次群众集会彻底失败。
- The town was forced to yield after a long siege. 该城受长期围困而被迫弃守。
- Let's collect the sap before its consolidation into a hard mass. 让我们在树液坚固成团之前将之收集起来。
- After harvest we will have a mass of rice. 秋收后,我们将获得大量稻谷。
- She says she doesn't like children in the mass. 她说从总体上讲她不喜欢孩子。
- These trees gave a high yield of fruit this year. 这些果树今年获得了大丰收。
- Capacity or inclination to yield under pressure. 支持不住在压力下屈服的能力或倾向
- These apple trees yield plenty of fruit this year. 这些苹果树今年结了许多苹果。
- He was forced to yield the castle. 他被迫放弃城堡。
- He didn't yield himself to his rival. 他没有向对手屈服。
- The current yield on municipal bonds is 10%. 当前市政债券的利润是百分之十。
- Soon the car will go into mass production. 这种小汽车不久即可投入批量生产。
- In experimental plots the yield has been doubled. 在试验田里,产量已(被)提高了一倍。
- I found a mass of spawn in the fish before cooking. 烧鱼前,我发现鱼里有很多鱼籽。
- The mass of workers do not want this strike. 大多数工人不愿举行这次罢工。
- A swelling or small palpable mass. 肿胀肿块或小的可摸到的块
- A metric unit of mass equal to 100 grams. 百克公制质量单位,等于100克。