国调直调设备调试工作开工许可,应以获得()批准的“调试启动调度方案”为准。
A.电科院
B.生产管理部门
C.调试指挥
D.国调
参考答案:D
It was in the lab _____ was taken charge of by Mr.Harris _____ they did the experiment.[ ]
A. which; that
B. that; which
C. that; whom
D. which; where
10名高血压患者服用某种降压药,比较服药前后平均血压有无差别,可进行()。
A.成组设计检验
B.成组设计t检验
C.配对设计u检验
D.配对设计t检验
E.配对设计γ2检验