单选题A tug is “in irons” when held in a fixed position by（）Athe weight of its tow，its being anchored，or groundedBthe weight of its towing hawser on the bottomCan adverse currentDlack of power or an engine breakdown
单选题
A tug is “in irons” when held in a fixed position by（）
A
the weight of its tow，its being anchored，or grounded
B
the weight of its towing hawser on the bottom
C
an adverse current
D
lack of power or an engine breakdown
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