Alamar 1.9. Drawbridge - Alamun dokokin zirga-zirga na Tarayyar Rasha

Jigilar ruwa ko tsallaka jirgin ruwa.

An girka a cikin n. n. na 50-100 m, a waje n. p. - na 150-300 m, ana iya sanya alamar a wata tazara daban, amma an tsara nisan a Tebur 8.1.1 "Nisan abu".

Ayyukan:

Dole ne a maimaita alamar a wajen sasantawa, yayin da aka sanya alamar da aka maimaita a nesa na aƙalla 50 m.