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單項(xiàng)選擇題

There is plenty of（）at this area.

A.A room
B.Room
C.Rooms
D.The room

單項(xiàng)選擇題

The primary reason for placing covers over storage batteries is to（）.

A.Prevent the accumulation of explosive gases
B.Protect the hull from leaking electrolyte
C.Prevent movement of the battery in rough waters
D.Protect against accidental shorting across terminals