藏文是一种拼音文字,总共有30个辅音字母、4个元音字母和5个反写字母。其中反写字母是用来拼写() ["佛经","活佛名字","外来语","声调"]
良性骨肿瘤一般表现为() ["X线摄片所见:骨质缺损,边缘清楚,骨膜反应明显","存在肿块","两者均是","两者均不是"]
火花放电的特征是电流()。 ["迅速减小","迅速增大","保持不变","与其无关"]
阳极板组合成的阳极板平面度公差为5㎐,其对角线误差不大于()。 ["6㎐","8㎐","10㎐","12㎐"]
大黄临床应用有() ["便秘","急性胰腺炎","上消化道出血","肾衰竭","肠梗阻"]
简述软水和无盐水的制备方法?