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單項(xiàng)選擇題

To develop maximum anchor holding power，the optimum angle between the anchor’s shank and the mooring lines is（）.

A.0 degrees
B.10 degrees
C.20 degrees
D.30 degrees

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

A.shown
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C.appeared
D.displayed

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There is plenty of（）at this area.

A.a room
B.room
C.rooms
D.the room

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