单项选择题
AccordingtoMARPOL73/78，Toenablepipesofreceptionfacilitiestobeconnectedwiththeship’sdischargepipelineforresiduesfrommachinerybilgesandfromoilresidue（sludge）tanks，bothlinesshallbefittedwithastandarddischargeconnectionthequantityoftheBoltsandnutsforthestandarddischargeconnectionis（）.
A.5B. 4
C. 6
D. 8
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