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Each life jacket light that has a non-replaceable power source must be replaced ______．
A.every 6 months after initial installation
B.every 12 months after initial installation
C.every 24 months after initial installation
D.on or before the expiration date of the power source
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单选题The light on a life jacket must be replaced（）.A
when the power source is replacedB
each year after installationC
every six monthsD
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单选题Each life jacket light that has a non-replaceable power source must be replaced（）.A
every 6 months after initial installationB
every 12 months after initial installationC
every 24 months after initial installationD
on or before the expiration date of the power source
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the mess roomB
each lifeboatC
each industrial work siteD
each fire station
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单选题On offshore drilling units，emergency lighting and each emergency power system must be tested at least once a（）.A
dayB
weekC
monthD
year
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