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單項(xiàng)選擇題

（）is the most liable to spontaneous combustion.

A.Cement
B.Chinaware
C.Fish meal
D.Steel products

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單項(xiàng)選擇題

（）my knowledge the figure at the loading port is not quite accurate.

A.At
B.In
C.To
D.With

單項(xiàng)選擇題

（）of this deratting exemption certificate is hereby extended until 4th 0ct.1988 as the vessel is laden with cargo.

A.Validity
B.Valid
C.Validation
D.The coming into force

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