- right angle viewer
- 直角: right angle
- 指示器: indicator; pointer; director ...
- 舵角指示器: helm indicator; helmindicator; rudder angle indicator; rudder indicator; rudder position indicator; rudder signal gear; rudder telltale; rudderindicator; steering index; tiller telltale; wheel angle indicator; wheelangleindicator
- 角指示器: angle indicator
- 倾角指示器: angle incidence indicator; ef; tilt indicator; tilting angle indicator
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