航海英語航海儀器使用說明書單項(xiàng)選擇題每日一練(2019.01.20)

來源：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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