单选题Cargo vessels being navigated，and fitted with emergency lighting and power systems，shall have their emergency systems tested at least once（）.Aa monthBin each weekCin every 6 monthsDin every 12 months
单选题
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
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