不能够判断结晶纯度的方法是
A.均一的晶形
B.均匀的色泽
C.溶解度
D.色谱如HPLC
E.熔距
参考答案:C
解析:判断结晶纯度一般根据结晶形态和色泽、熔点和熔距、色谱法。
—Have you got your new job yet, Bob?
—Kind of. But the interviewer said they needed a reference from my former employer ________ they
could give me a definite offer.[ ]
A. until
B. when
C. once
D. before
账户按经济内容分类,属于成本类账户的是( )。
A.生产成本
B.未分配利润
C.盈余公积
D.所得税