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? （） -题库考试答案搜索网

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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2022-01-03 19:34

A、Their bearing is almost constant，even when the true bearing of the contact changes appreciably
B、They always appear on a bearing of 90°From the true bearing of the contact
C、The indirect echoes usually appear in shadow sectors
D、When plotted，their movements are usually abnormal

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标签：固体散装危险品与BC规则

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