铝合金缸体、缸盖比铸铁的更难焊接,最好的焊接方法()。 ["亚氟焊","CO2保护焊","乙炔焊","钎焊"]
按包裹托运免检物品时,每件不得超过()。 ["40kg","20kg","60kg","50kg"]
下面哪些是有效的IP主机地址(). ["127.13.214.254","305.299.13.1","227.405.13.112","105.14.155.12"]
广播数据包通常采用广播地址(). ["单播地址","组播地址","广播地址","全零地址"]
施工升降机的电缆防护装置一般由()组成。 ["电缆支架","电缆出线架","电缆进线架","电缆导向架","电缆储筒"]
公元前154年,吴王刘濞联合其他的诸侯国发动了叛乱,史称()