单项选择题
A （）, sometimes called filters, is a device designed to prevent the passage of unwanted solids into the system.
A.steam trap
B.check valve
C.separator
D.strainer
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A.a check valve
B.a gate valve
C.a pressure reducing valve
D.a quick closing valve -
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The main objective of the SOLAS Convention is to specify （） for the construction, equipment and operation of ships, compatible their safety.
A.at most references
B.at least references
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Annex IV of MARPOL 73/78 contains regulations for the prevention of （）.
A.pollution by oil
B.pollution by noxious liquid substances carried in bulk
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D.pollution by garbage from ships
