单选题Each hand portable，semi-portable and fixed fire extinguishing unit on a ship must be tested and inspected at least once every（）.Asix weeksBsix monthsCtwelve monthsDtwo years
单选题
Each hand portable，semi-portable and fixed fire extinguishing unit on a ship must be tested and inspected at least once every（）.
A
six weeks
B
six months
C
twelve months
D
two years
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