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Qhov zoo ntawm steel grating

Qhov zoo ntawm kev siv tsis pom manhole npog

Cov lus qhia tseem ceeb rau xaiv Barbed Hlau

Kev ua haujlwm ntawm barbed hlau

Barbed Hlau Taw Qhia

Dab tsi yuav tsum tau ceev faj thaum thauj cov npog manhole npog?

Kev tu thiab tu ntawm cov npog manhole npog

Tsim lub tswv yim ntawm invisible manhole npog

Daim ntawv thov scenarios ntawm invisible manhole npog

Kev loj hlob zeem muag ntawm guardrails

Design concept of guardrail

kev ua haujlwm ntawm guardrails