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單項(xiàng)選擇題

Officers observe ships with a pair of （）（望遠(yuǎn)鏡）.

A.sextant
B.binoculars
C.compass
D.radar

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單項(xiàng)選擇題

The （）（天線）is like a dish.

A.line
B.thread
C.aerial
D.wire

單項(xiàng)選擇題

This is a radio （）（測(cè)向儀）.

A.compass
B.direction finder
C.loran
D.sextant

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