單項選擇題

Poor packing will cause much trouble（）delivery.

A.at
B.for
C.in
D.on

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單項選擇題

Proper use shall be made（）radar equipment.

A.with
B.to
C.for
D.of

單項選擇題

Radar is used to not only to look（）,but also to measure their distances away from you.

A.at obscured objects
B.forward submerged targets
C.up exposed targets
D.for unseen objects

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