单选题For ships equipped with an SES, it is（）and（）for the operator to send a distress alert.Aeasy/reliableBdifficult/cheapCstable/compulsoryDeasy/expensive
单选题
For ships equipped with an SES, it is（）and（）for the operator to send a distress alert.
A
easy/reliable
B
difficult/cheap
C
stable/compulsory
D
easy/expensive
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