常用控制器的控制规律有双位控制、（）和比例微分控制
A.比例控制
B.积分控制
C.PID
D.微分控制
E.PI
参考答案：A, B, D
高温段过热器的蒸汽流通截面（）低温段的蒸汽流通截面。
A、大于
B、等于
C、小于
An Intranet is (71) the application of Internet technology within an internal or closed user group．Internets are company (72) and do not have a (73) connection to the Internet．Used properly an Internet is highly effective corporate tool，capable of regularly (74) information to empower the workforce with the information needed to perform their roles．Used in this way，Internet represent a step towards the (75) office．
A．physical
B．psycological
C．spatial
D．spirited
