[单选] 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? （）

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

在Windows 2000操作系统中，要进行各种输入法的切换，应按（）。 Ctrl+空格键。 Ctrl+Shift键。 Shift+空格键。 Alt+功能键。什么是单品牌上柜率？对标准进行复审，其主要目的是为了确认标准的有效性，其结果有（）废止。重新修订。确认有效。降级。中国传统文化截止时间为（）。 1919年。 1912年。 1949年。 1840年。 ATM（）等操作完成且关闭ATM保险柜门后，ATM出纳员应先立即锁闭机械锁，ATM记账员随即打乱密码锁。维护。清机。加钞。轧账。 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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[单选] 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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