Tag nrho qhov siab ntawm lub suab barrier yog 3 qhov siab, muab faib ua ob ntu.Sab saum toj yog 1-meter-siab hlau shutter suab-absorbing barrier.Qhov nruab nrab thiab qis qis txais yuav 1.-meter-siab xim steel phaj suab teeb meem.
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Post lub sij hawm: Dec-12-2019