个人坠落保护系统是用于阻止从工作高度坠落的一种系统，包括有（），还可能包括带有自锁钩的安全绳、缓冲器、吊绳或它们的组合。
A. 锚固点
B. 安全帽
C. 连接器
D. 全身式安全带
查看答案
旅客不能按票面指定的日期、车次乘车时，在不延长客票有效期的前提下，可以在任何售票点办理提前或改晚乘车签证手续。（部竞赛题）
A. 正确
B. 错误
If the gyrocompass error is east，what describes the error and the correction to be made to gyrocompass headings to obtain true headings?（）.
A. The readings are too low (small numerically) and the amount of the error must be added to the compass to obtain true
B. The readings are too low and the amount of the error must be subtracted from the compass to obtain true
C. The readings are too high (large numerically) and the amount of the error must be added to the compass to obtain true
D. The readings are too high and the amount of the error must be subtracted from the compass to obtain true
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