中国药典中药物杂质检查(限量)的方法多是:
A.杂质对照品法和高低浓度对比法
B.容量法测含量
C.重量法测含量
D.分光光度法测含量
E.色谱法定量
参考答案:A
下列计算结果等于1的是( )
A.(-2)+(-2)
B.(-2)-(-2)
C.-2×(-2)
D.(-2)÷(-2)
I was talking with my monitor when a fight ________between the students of the two classes.[ ]
A. blocked out
B. hung out
C. watched out
D. broke out