填空題當(dāng)成品的電源線外露長(zhǎng)棄小于()米時(shí),UL規(guī)格的說(shuō)明書必須有短線說(shuō)明﹐若是極性兩扁插﹐還須有極性插的說(shuō)明﹐且警語(yǔ)字高須大于4.8mm.