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单选题
The primary barrier of a bulk carrier is formed by（）.
A
the single skin side shell and the inner bottom
B
deck strips，hatch covers and coamings
C
the vertically corrugated transverse watertight bulkheads
D
the single skin side shell between topside and hopper tanks，and the cross deck strips，hatch covers and coamings
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以上都不对
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