[问答题] 简述道家老子的为人处世之道。

乘用车的铭牌主要包括哪些项目？ What safety precautions should be observed by the crew while working around machinery in an engine room?（） ["They should wear safety shoes","They should wear ear protection","They should not wear jewelry","All of the above"] 美国现在每隔（）公里，有一台3D打印机。 ["1","2","2.5","5"] 现有10只60瓦，220伏白炽灯，其线路安装的保险丝（单相供电）应选择（） ["#22铅保险丝，该保险丝额定电流为3.3安","额定电流为10A的保险丝","是保险丝就可以用","两条保险丝并联，这样可以双保险"] 黄铜件的主要焊接方法是（） ["焊条电弧焊","气焊","氩弧焊","CO_{2<\/sub>气体保护焊"] 简述道家老子的为人处世之道。}