It is quite（）for an SES operator to send a distress alert.<br>A:easy and expensive<br>B:simple and certain<br>C:dangerous and stable<br>D:difficult and compulsory

It is quite（）for an SES operator to send a distress alert.
A:easy and expensive
B:simple and certain
C:dangerous and stable
D:difficult and compulsory

出自：海船船员证

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