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單項選擇題

“How do you read?” “I read you with signal strength one”（）.

A.poor
B.bad
C.fair
D.good

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單項選擇題

LAND-BASED AUTHORITY CONDUCTING AND CO-ORDINATING SEARCH AND RESCUE OPERATIONS IN A DESIGNATED AREA defines（）.

A.RCC
B.OSC
C.CSS
D.GPS

單項選擇題

When my ship arrived there，their ship（）.

A.has left already
B.left already
C.had left already
D.would left already

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