This arrangement is （） if the elements are directly connected to one another and the control action takes place without human involvement.<br>A:a manual closed loop<br>B:a manual opened loop<br>C:an automatic closed loop<br>D:an automatic opened loop

This arrangement is （） if the elements are directly connected to one another and the control action takes place without human involvement.
A:a manual closed loop
B:a manual opened loop
C:an automatic closed loop
D:an automatic opened loop

出自：海船船员证

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