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航海英語(yǔ)航海儀器使用說(shuō)明書(shū)單項(xiàng)選擇題每日一練(2019.01.20)
來(lái)源:考試資料網(wǎng)
1
An indirect radar echo is caused by a reflection of the main lobe of the radar beam off the observer’s vessel. Which of the following is NOT a characteristic of indirect echoes?().
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2
The transmission time duration of a single pulse of radio-frequency energy is a function of the().
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3
A FICTIVE LINE DISPLAYED ON THE RADAR SCREEN SEPARATING THE FAIRWAY FOR INBOUND AND OUTBOUND VESSELS SO THAT THEY CAN SAFELY PASS EACH OTHER defines().
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4
AREAS WHICH CANNOT BE SCANNED BY THE RADAR OF THE VESSEL BECAUSE THEY ARE SHIELDED BY PARTS OF ITS SUPERSTRUCTURE,MASTS,ETC means().
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5
A Doppler speed log indicates speed over ground().
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