尿液分析仪试剂带空白块的作用是()
A.消除不同尿液标本颜色的差异
B.消除试剂颜色的差异
C.消除不同光吸收差异
D.增强对尿标本的吸收
E.减少对尿标本的吸收
参考答案:A
I was out of town at thetime, so I don't know exactly how it ____. [ ]
A. was happening
B. happened
C. happens
D. has happened
一个模块应具备输入和输出、处理功能、内部数据和_________四个要素。