单项选择题
Vessels should be manned（）duly qualified officers and crew adequate（）ensure the safety of navigation.
A.by/to
B.with/to
C.with/for
D.from/for
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A.by which
B.through which
C.by that
D.through that -
单项选择题
When（）,the provision of the bill of lading will be used as a basis for settlement.
A.an event is in connection with the marine peril at sea
B.a matter is linked to a person injury
C.a fact is being contacted by charter party
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When the（）is large, the ship is stiff; and when it is small, she is tender.
A.GM
B.free surface
C.longitudinal center of gravity
D.transverse center of gravity
