单项选择题
Joiner bulkheads on a vessel provide（）.
A.compartmentalization B.watertight integrity C.structural support D.tank boundaries
单项选择题 Individual wires，used in systems greater than 50 volts,（）.
单项选择题 Increasing the number of slack liquid tanks has the effect of raising the（）.
单项选择题 In which case is the IOPP Certificate of an inspected vessel NOT invalidated? （）
