In （）the control action is independent on the output.<br>A:a closed loop control system<br>B:an open loop control system<br>C:a boiler control system<br>D:a steering gear

In （）the control action is independent on the output.
A:a closed loop control system
B:an open loop control system
C:a boiler control system
D:a steering gear

出自：海船船员证

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