Cargo vessels being navigated，and fitted with emergency lighting and power systems，shall have their emergency systems tested at least once（）.<br>A:a month<br>B:in each week<br>C:in every 6 months<br>D:in every 12 months

Cargo vessels being navigated，and fitted with emergency lighting and power systems，shall have their emergency systems tested at least once（）.
A:a month
B:in each week
C:in every 6 months
D:in every 12 months

出自：海船船员证

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