进近灯延伸至移位的跑道入口。（）
A. Theapproachlightsareextendedtotheshiftedentrance.
B. Theapproachlightsareextendedtothedisplacedthreshold.
C. Theapproachlightsareextendedtothedisplacedentrance.
D. Theapproachlightsareextendedtotheshiftedthreshold.
目视进近坡度指示器（）
A. SeeingApproachSlopeIndicator.
B. SeeingApproachSlopeIndication.
C. VisualApproachSlopeIndication.
D. VisualApproachSlopeIndicator.
精密进近航道指示器。（）
A. PrecisionApproachChannelIndicator.
B. PrecisionApproachPathIndicator.
C. AccurateApproachChannelIndicator.
D. AccurateApproachPathIndicator.
下列符号属于高压开关电器的是（）
A. RN
B. DN
C. FW
D. RW
E. GN
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