樓頂大字分為特級做A爰片毛片免費69:發光字和(he)不發(fa)光(guang)(guang)(guang)兩種。發(fa)光(guang)(guang)(guang)字(zi)(zi)(zi)分為吸塑字(zi)(zi)(zi)和(he)LED外露燈(deng)發(fa)光(guang)(guang)(guang)字(zi)(zi)(zi)，不發(fa)光(guang)(guang)(guang)字(zi)(zi)(zi)按材料分為鈦金字(zi)(zi)(zi)，不銹(xiu)鋼字(zi)(zi)(zi)，烤漆字(zi)(zi)(zi)。樓(lou)頂(ding)大(da)字(zi)(zi)(zi)即是(shi)由(you)鋼結構支撐架和(he)金屬字(zi)(zi)(zi)形組成(cheng)(cheng)的(de)大(da)型廣告(gao)字(zi)(zi)(zi)。鋼架一般由(you)(鍍(du)鋅(xin))角鐵焊(han)成(cheng)(cheng)片梯或(huo)(huo)者方籠(long)制成(cheng)(cheng)，樓(lou)頂(ding)發(fa)光(guang)(guang)(guang)字(zi)(zi)(zi)字(zi)(zi)(zi)形由(you)不銹(xiu)鋼板(ban)或(huo)(huo)鍍(du)鋅(xin)板(ban)做字(zi)(zi)(zi)殼，內置LED模(mo)組，吸塑字(zi)(zi)(zi)字(zi)(zi)(zi)面由(you)亞克(ke)力板(ban)制作。LED外露燈(deng)發(fa)光(guang)(guang)(guang)大(da)字(zi)(zi)(zi)則是(shi)在金屬板(ban)上沖好孔(kong)，然(ran)后再用激(ji)光(guang)(guang)(guang)切(qie)割成(cheng)(cheng)型，.后焊(han)接成(cheng)(cheng)字(zi)(zi)(zi)形，裝燈(deng)。固(gu)定在鋼架上完成(cheng)(cheng)。