单选题A heavy steel curved arch constructed athwartships and above the after deck on a towing vessel is sometimes called a（）.Amain braceBtow spanCjockey barDNone of the above
单选题
A heavy steel curved arch constructed athwartships and above the after deck on a towing vessel is sometimes called a（）.
A
main brace
B
tow span
C
jockey bar
D
None of the above
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