Some laxative drugs such as magnesium sulfate , Bisatin, phenolphthalein, glycerol etc for common use were introduced. 介绍了几种治疗慢性便秘的药剂,包括:硫酸镁, 比沙啶,酚酞, 甘油,开塞露等.并着重介绍了它们的用法.
推进器的叶片已经安装好了.The propeller blade has been mounted.然后地面控制人员将会发射推进器，把卫星送入正常轨道。Ground controllers will then fire the booster, sending the satellite into its proper orbit.较轻的推进器采用液态氢, 较重的采用自燃推进剂.The lighter version used liqu...