对信号进行全面监测,并将其汇集在一起形成一个设备工作状态信号子集,这是故障诊断基本步骤中的()。
A.诊断决策
B.状态识别
C.特征提取
D.信号监测
参考答案:D
Please be quiet. We are not allowed _______ much noise in the reading room. [ ]
A. to make
B. make
C. making
D. to making
Ⅱ型呼吸衰竭,PaCO2必须大于()
A.70mmHg
B.45mmHg
C.65mmHg
D.50mmHg
E.60mmHg