单选题Regulations require that cargo pumps in tankers carrying grade D liquid cargo shall be isolatedfrom sources of vapor ignition by（）.AcofferdamsBgastight bulkheadsCpassageways or living quartersDgeneral cargo spaces
单选题
Regulations require that cargo pumps in tankers carrying grade D liquid cargo shall be isolatedfrom sources of vapor ignition by（）.
A
cofferdams
B
gastight bulkheads
C
passageways or living quarters
D
general cargo spaces
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