用溴量法测定吡啶类药物的含量时,常用的指示剂是
A.甲基橙
B.曙红
C.荧光黄
D.碘离子
E.铁铵钒指示剂
参考答案:A
A man or woman makes direct contact with society in two ways: as a member of some familial, professional or religious group, or as a member of a crowd.
A.intimate
B.very familiar
C.relating to the family
D.private
房屋建筑工程施工的安全管理检查评定时,下列选项中不是塔式起重机检查评定的一般项目的是()
A、电气安全
B、基础和轨道
C、附着
D、吊钩