单选题A vessel restricted in her ability to maneuver when engaged in an operation for the maintenance of safety of navigation in a traffic separation scheme is()complying with this rule to the extent necessary to carry out the operation.AobligedBto beCexempted fromDnecessarily
单选题
A vessel restricted in her ability to maneuver when engaged in an operation for the maintenance of safety of navigation in a traffic separation scheme is()complying with this rule to the extent necessary to carry out the operation.
A
obliged
B
to be
C
exempted from
D
necessarily
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