单项选择题

How long must the GMDSS radio log be retained on board ________．
A.At least two years after the last entry
B.At least one year after the last entry
C.At least 90 days after the last entry
D.At least 30 days after the last entry

A.A.At
B.At
C.At
D.At

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问答题

查封违法设施是行政主体作出的行为。‍ ‍

单项选择题

以下结构图形的弯矩值，哪一项是错误的？（梁跨度均为L）（）

A.见图A
B.见图B
C.见图C
D.见图D

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