Many navigational warnings are of a temporary nature,but others remain in force for several months or may be succeeded by().
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
要了解某张海图的现行版日期时可查阅()。
Ⅰ.航海图书总目录;Ⅱ.英版航海通告累积表;Ⅲ.英版航海通告年度摘要;Ⅳ.季末版航海通告。
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