单选题The service life of distress signals must be not more than（）.Aforty two months from the date of manufactureBthirty six months from the date of the last inspectionCtwenty four months from the date of approvalDtwelve months from the date of purchase
单选题
The service life of distress signals must be not more than（）.
A
forty two months from the date of manufacture
B
thirty six months from the date of the last inspection
C
twenty four months from the date of approval
D
twelve months from the date of purchase
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