Keep in visual signalling touch . 保持在看得見信號(hào)的距離中。
Audible and or visual signaling appliances for fire alert 火災(zāi)聲和或光警報(bào)器
Audio and visual signals of the emergency alarm system 視聽警號(hào)兩部份的緊急警報(bào)系統(tǒng)
Development of a new mine audible and visual signal device 新型礦用電子聲光信號(hào)裝置的研制
She still has her hood on blocking all the visual signals 她還有遮光罩阻斷所有視覺訊號(hào)。
If a whistle is not available , use the visual signal alone 如果無(wú)口哨的話,只使用可視信號(hào)。
Surface colors for visual signalling 視覺信號(hào)表面色
Visual signaling appliances - private mode emergency and general signaling 可視信號(hào)發(fā)送裝置.專用應(yīng)急和通用信號(hào)發(fā)送
Visual signalling appliances - private mode emergency and general utility signalling 可視信號(hào)裝置.專用型應(yīng)急信號(hào)和通用信號(hào)
Standard practice for visual signals between persons on the ground and in aircraft during ground emergencies 地面發(fā)生緊急情況時(shí)地勤人員與飛行器中人員之間可視信號(hào)的標(biāo)準(zhǔn)規(guī)范