樓頂大字分為特級做A爰片毛片免費69:發光字和不發(fa)(fa)光(guang)兩種(zhong)。發(fa)(fa)光(guang)字(zi)(zi)(zi)分為吸(xi)(xi)塑字(zi)(zi)(zi)和LED外露燈發(fa)(fa)光(guang)字(zi)(zi)(zi)，不發(fa)(fa)光(guang)字(zi)(zi)(zi)按材(cai)料分為鈦(tai)金字(zi)(zi)(zi)，不銹鋼(gang)字(zi)(zi)(zi)，烤漆字(zi)(zi)(zi)。樓(lou)頂(ding)大字(zi)(zi)(zi)即是由(you)鋼(gang)結構支撐架(jia)和金屬字(zi)(zi)(zi)形組成(cheng)(cheng)(cheng)的大型廣告(gao)字(zi)(zi)(zi)。鋼(gang)架(jia)一般由(you)(鍍鋅)角鐵焊成(cheng)(cheng)(cheng)片(pian)梯或者方籠制(zhi)成(cheng)(cheng)(cheng)，樓(lou)頂(ding)發(fa)(fa)光(guang)字(zi)(zi)(zi)字(zi)(zi)(zi)形由(you)不銹鋼(gang)板(ban)或鍍鋅板(ban)做字(zi)(zi)(zi)殼，內置LED模組，吸(xi)(xi)塑字(zi)(zi)(zi)字(zi)(zi)(zi)面由(you)亞克力板(ban)制(zhi)作。LED外露燈發(fa)(fa)光(guang)大字(zi)(zi)(zi)則是在(zai)金屬板(ban)上沖好孔，然后再(zai)用激光(guang)切割成(cheng)(cheng)(cheng)型，.后焊接成(cheng)(cheng)(cheng)字(zi)(zi)(zi)形，裝(zhuang)燈。固定在(zai)鋼(gang)架(jia)上完(wan)成(cheng)(cheng)(cheng)。