单项选择题
Which kind of the following controllers is the most sophisticated controller?（）
A.Proportional controller B.Integral controller C.Derivative controller D.PID controller
单项选择题 The word “offset” most probably means（）
单项选择题 TWO STEP CONTROLER ACTION is mainly（）
单项选择题 In the event of failure of an auxiliary such as a lubricating pump, the standby pump is started and put on the line automatically“the line” in this sentence refers to（）
