單項(xiàng)選擇題There is something wrong with our radar.All kinds of objects can’t be clearly()within the definite range.

A.Shown
B.Expressed
C.Appeared
D.Displayed


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1.單項(xiàng)選擇題There is plenty of()at this area.

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

2.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

3.單項(xiàng)選擇題The master should()necessary precautions to prevent accidents or damage.

A.do
B.take
C.set
D.have