Cargo booms must be weight tested to recertify the Safe Working Load (SWL) every（）.<br>A:year<br>B:two years<br>C:four years<br>D:five years

Cargo booms must be weight tested to recertify the Safe Working Load (SWL) every（）.
A:year
B:two years
C:four years
D:five years

出自：海船船员证

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