Cyclopentanone ethylene ketal was synthesized with I _ 2 as catalyst.以单质碘为催化剂合成了环戊酮乙二缩酮.The effects of reactant mole ratio , catalyst dosage , microwave irradiationtimeyield of cyclohexanone glycol ketal were investigate...
竖井是为了通风和挖掘 、 修理坎儿井时提土之用的.Shaft to ventilation and excavation, repair qanat soil when used.坎儿井引出了地下河水, 使沙漠变成绿洲.Qanat leads to an underground river, so the desert into an oasis.这些就是坎儿井的竖井口.These are the qanat mouth of the ...
1.5 million signatures have been collected.已经收集到150万人的签名。Ensure all paid out vouchers have proper authorisation, signatures and backup.所有付出的凭证有授权, 签字和备份.Quasars are the signatures of distant galaxies housing multi - spec...
Pink with faint blue, crown _ shaped ; lateral flowers spars, spreading, sterile.粉色,微蓝, 皇冠型.株型开张, 花朵侧开.叶片长尖而稀.吐芽少. 无结实能力.He always made sure that any cuts were protected by sterile dressings.他总是坚持要用无菌纱布包扎伤口。All diploid s...