There was a fire in the street last night, but the firemen _____ within twenty minutes. [ ]

A. took it out

B. brought it out

C. worked it out

D. put it out

尿干化学分析仪主要优点，错误的是

A．标本用量少
B．检测速度快
C．检测项目多
D．检测准确性、重复性好
E．适用确诊