The service life of distress signals must be not more than（）.<br>A:forty two months from the date of manufacture<br>B:thirty six months from the date of the last inspection<br>C:twenty four months from the date of approval<br>D:twelve months from the date of purchase

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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