single heading course 单向航线
single-heading course 等角航线
course heading 航向
course heading servo 航向伺服 ; 航向伺服系统
course marker heading marker 航向标志器
course heading rudder 航向舵
course heading signal 航向信号
·2,447,543篇论文数据，部分数据来源于NoteExpress
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