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【单选题】
A ship station on receiving a shore-to-ship distress alert should（）.
A.
keep silence
B.
interfere with such communication
C.
establish communication as directed and render such assistance as is required and appropriate
D.
refuse communication as directed and render such assistance as it required and appropriate
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】The GMDSS must combine all various subsystems, because（）.
A.
they all have different limitations with respect to coverage
B.
they all have different limitations in the technology they use
C.
different systems apply to different ships
D.
all of above
【单选题】EXCEL中，下面关于分类汇总的叙述，错误的是（）。
A.
分类汇总前必须按关键词段排序数据库
B.
汇总方式只能是求和
C.
分类汇总的关键词段只能是一个字段
D.
分类汇总可以被删除，但删除汇总后排序操作不能撤消