ForshipsequippedwithanSES,itis（）and（）fortheoperatortosendadistressalert. A: easy/reliable B: difficult/cheap C: stable/compulsory D: easy/expensive
ForshipsequippedwithanSES,itis（）and（）fortheoperatortosendadistressalert. A: easy/reliable B: difficult/cheap C: stable/compulsory D: easy/expensive
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