题目内容
There are three main states of flow in hydraulic system, such as _________,_________and _________in a pipe.
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The liquid have two flow state in the pipeline, viscous force play a leading role for _______ flow, inertial force play a leading role for __________. The liquid flow state can be judged by ______________.
In pneumatic transmission, F.R.L is short for the combination of __________, _____________ and ______________.
Similar to hydraulics, the pneumatic actuators are divided basically into two categories:___________ and ___________.
____________ actuator has similar construction like a Vane motor with a limited turning angle, rotating angle between 45 and 270 degrees.
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