问题
单项选择题
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
答案
参考答案：A
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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
参考答案：A