A.Have
B.Has
C.Has there been
D.Are there
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A.If
B.Shall
C.Should
D.Whether
A.two certificates have expired
B.two certificates will expire
C.one of the two certificates have expired
D.one of the two certificates will expire
A.has the full force of the regular Certificate of Inspection
B.expires six months after it is issued
C.must be exchanged for a regular Certificate of Inspection within 3 months
D.is retained in the custody of the Master
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An inert gas system on a tanker should be used to（）.
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A safe fuel system must（）.
Entries should be made in a Ro-Ro vessel’s cargo-securing device record book for（）.
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Permanent magnetism is found in（）.
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