How many life buoys________on board with self-igniting light?A.there existB.there isC.there areD.are there
How many life buoys________on board with self-igniting light?
A.there exist
B.there is
C.there are
D.are there
相关考题：
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单选题How many operators are needed／required on board according to the provisions of the International Convention for the Safety of Life at Sea，1974?（）.A4 operatorsB3 operatorsC2 operatorsD1 operator
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单选题How many adult life jackets are required on board a ship?（）AEnough for 100 percent of the persons allowed on boardBOne for each work station and industrial work siteCEnough for 150 percent of the persons allowed on boardDBoth A and B above
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单选题How many life buoys（）on board with self-igniting light?Athere existBthere isCthere areDare there