What is a“Special Warning”().
An urgent message concerning a vessel in distress
B. A weather advisory about unusual meteorological or oceanographic phenomena hazardous to vessels
C. A broadcast disseminating an official government proclamation affecting shipping
D. A radio navigational warning concerning a particularly hazardous condition affecting navigatio
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通风除尘装备应指定专人管理。
A. 正确
B. 错误
冻结窗口可将工作表的()窗格冻结在屏幕上。
A. 上面和左面
B. 上面和右面
C. 下面和左面
D. 下面和右面