Ships equipped with Inmarsat SES send distress alerts both（）.<br>A:quick and good<br>B:convenient and certain<br>C:easily and simply<br>D:important and difficult

Ships equipped with Inmarsat SES send distress alerts both（）.
A:quick and good
B:convenient and certain
C:easily and simply
D:important and difficult

出自：海船船员证

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