单选题When under maneouvring conditions with the machinery being manually operated the control unit or console should be （）Aautomatically controlledBcontinuously mannedCoff powerDnone of the above is true
单选题
When under maneouvring conditions with the machinery being manually operated the control unit or console should be （）
A
automatically controlled
B
continuously manned
C
off power
D
none of the above is true
参考解析
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