For ships equipped with an SES, it is（）and（）for the operator to send a distress alert.<br>A:easy/reliable<br>B:difficult/cheap<br>C:stable/compulsory<br>D:easy/expensive

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

出自：海船船员证

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