99色精品-9色在线-99色在线-99色视频 国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精

單項選擇題

The control mode where the position of the final control element has a linear relationship with the position or value of the controller, variable is known as()

A.two position control
B.proportion control
C.reset control
D.rate control

微信掃碼免費搜題