各部机械润滑要好,避免过热,注干油机件温度不超过()℃。 ["50","60","70","80"]
属非选择性COX抑制剂,镇痛作用强() ["布洛芬","双氯芬酸","萘丁美酮","美洛昔康","塞来昔布"]
热水气排气管穿墙部位与墙间的间隙应密封,是为了防止()。 ["烟气回流入室","烟气滞留","烟气外泄","烟气排放"]
以下属于LINUX的内置的帐户的有() ["admin","root","guest","bi"]
陶瓷砖进场时的实验报告应由()。 ["尺寸偏差","表面质量","吸水率","破坏强度","密实度"]
世界上现存最早的目录是什么?