问题
单项选择题
A p back refers to a（）.
A.bar securing a cargo port
B.centerline vertical bulkhead
C.deep beam
D.spanner stay
答案
参考答案：A
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A p back refers to a（）.
A.bar securing a cargo port
B.centerline vertical bulkhead
C.deep beam
D.spanner stay
参考答案：A