其基本成分除了电子和离子外,还包括通常带负电的尘埃微粒.Dusty plasmas consist of electrons, ions and usually negatively charged dusty micro - particles.盐是由带正电的钠离子和带负电的氯离子构成的.Salt is made of two ions: positively charged sodium and negatively charged...
...a walk along the ramparts of the Old City.沿着老城的城墙漫步A number of staircases ascend from the cobbled streets onto the ramparts.一段石阶从鹅卵石路上一直向上直通城墙。Blocks of flats have been holed and some shells have fallen within the his...
解决了最初的一些问题之后，终于成功地制造出了大量丙酮。After some initial problems, acetone was successfully produced in quantity.这两个氨基酸从丙酮酸获得它们的碳架.These two amino acids derive their carbon skeletons from pyruvate.将乙酰丙酮铁, 苯基B- 萘胺及磷脂通过40目筛加入.The fer...