在重金属的检查中，加入硫代乙酰胺试液是作为
A．标准溶液
B．显色剂
C．pH调整剂
D．掩蔽剂
E．稳定剂
参考答案：B
Although my grandfather is in his eighties, he is still as ________ as a young man and hates sitting around doing nothing all day.
A．enthusiastic
B．intelligent
C．energetic
D．sensitive
秘书在领导者、主事者身边综合办理的日常事务有（）。
A.办文办事办会
B.沟通信息
C.协调事务
D.完成交办事项
E.提供跟踪综合公务服务
Although my grandfather is in his eighties, he is still as ________ as a young man and hates sitting around doing nothing all day.