您要查找的是不是：
- Ethyl estrenol preparation 乙雌烯醇制剂
- ethyl estrenol 乙基孕醇
- Experience is their preparation for giving advice. 经验为她们进行咨询作了准备。
- The advertising campaign is still in preparation. 广告宣传攻势仍在准备中。
- You can't pass an exam without preparation. 不准备就考不及格。
- A drug or preparation containing arsenic. 砷化合物含砷的药剂或制剂
- The dictionary is now in rapid preparation. 这本词典现在正在迅速编写之中。
- The preparation for his cough included camphor. 为医治他的咳嗽而调制的药中包括樟脑。
- Glycerol or a preparation of glycerol. 甘油，丙三醇甘油或丙三醇配制品
- Made up without preparation; improvised. 即兴的不经准备而作的; 即兴的
- To introduce the ethyl group into(a compound). 使乙基化把乙基引入（一化合物）
- Care or preparation in advance; foresight. 先见，提前考虑或准备; 远见
- Years of work have gone into the preparation of this dictionary. 这部词典的筹备工作已进行了多年。
- In this paper, the preparation of hydroxy ethyl chitosan sulfate was studied. 研究了磺化羟乙基壳聚糖的制备方法。
- They have made good preparation for the upcoming elections. 他们对即将到来的选举作了充分的准备。
- He didn't do any preparation for this exam, so he failed. 他考试前没做任何准备，所以不及格。
- He sharpened his knife in preparation for carving the meat. 他磨快了刀准备切肉。
- It was foolish to take the test without preparation. 没有准备就去应试是愚蠢的。
- Ethyl acetate(71. 41b)was added to the slurry in the vessel. 把醋酸乙酯71.;4磅加到容器中的浆液内。
- Ethyl lactate was synthesized with sodium bisulfate. 采用硫酸氢钠为催化剂合成乳酸乙酯。
