单项选择题
A.short circuit B.speed up C.slow down D.hunting
Prior to any overhaul work on electric equipment, it is...
单项选择题Prior to any overhaul work on electric equipment, it is important to ensure the circuits are （）.
A.live B.dead C.excited D.on line
（） control system is one in which the control action is...
单项选择题（） control system is one in which the control action is independent of the output.
A.Feed back B.Negative feed back C.Close loop D.Open loop
（） power is the power developed within the cylinder and...
单项选择题（） power is the power developed within the cylinder and can be measured by an engine indicator.
A.The shaft B.The mechanical C.The electric D.The indicated
