单选题This arrangement is （） if the elements are directly connected to one another and the control action takes place without human involvement.Aa manual closed loopBa manual opened loopCan automatic closed loopDan automatic opened loop
单选题
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
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