【单选题】阿司匹林中检查游离水杨酸的方法为:取本品0.1g,加乙醇1ml溶解后,加水使成50ml,立即加新配制的稀硫酸铁铵试液1ml,30s内如显色,与水杨酸对照液(0.1mg/ml)1ml同法制备溶液比较,颜色不得更深。其游离水杨酸的限量为( )。
【单选题】阿司匹林中检查游离水杨酸的方法为:取本品0.1g,加乙醇1ml溶解后,加水使成100ml,立即加新配制的稀硫酸铁铵试液1ml,30s内如显色,与水杨酸对照液(0.1mg/ml)1ml同法制备溶液比较,颜色不得更深。其游离水杨酸的限量为
【单选题】关于糖尿病的运动治疗,错误的是:( )
C.
要遵循因人而异,量力而行,循序渐进,持之以恒
【单选题】This is one of the best books ______ on the subject.
A.
that have ever been written
B.
which have ever been written
C.
that has ever been written
D.
whatever have been written
【单选题】阿司匹林中检查游离水杨酸的方法为:取本品0.1g,加乙醇1ml溶解后,加水使成100ml,立即加新配制的稀硫酸铁铵试液1ml,30s内如显色,与水杨酸对照液(0.1mg/ml)1ml同法制备溶液比较,颜色不得更深。其游离水杨酸的限量为
【单选题】This is the (longest) flight I (have ever taken). By the time we get to Los Angeles, we (had flown) (for) 9 hours.
【判断题】四氯乙烯分子在红外光谱上没有 υ(C=C)吸收带。
【单选题】阿司匹林中检查游离水杨酸的方法为:取本品0.1g,加乙醇lml溶解后,加水使成50ml,立即加新配制的稀硫酸铁铵试液1ml,30s内如显色,与水杨酸对照液(0.1mg/ml)lml同法制备溶液比较,颜色不得更深。其游离水杨酸的限量为
【判断题】四氯乙烯分子在红外光谱上没有υ(C=C)吸收带。( )