A strong，often violent，northerly wind occurring on the Pacific coast of Mexico，particularly during the colder months，is called（）. ["Tehuantepecer","Papagayo","Norther","Pampero"] The centrifugal pump component responsible for converting the mechanical energy of the liquid being pumped, to that of kinetic energy is the （）. ["electric motor","volute","impeller","diffusion nozzle"] 亨利・法约尔提出了下列组织管理的一系列重要概念，除了（）。 ["工作标准化","纪律与秩序","正是的规则和制度","控制幅度"] 原油乳化以后，油品含水增加，在（）K，原油的比热溶仅为水的比热容的42%～60%。 ["283～473","93～100","28～47","83～73"] 易燃易爆的场所，有腐蚀气体的场所，露天照明的场所分别采用（）灯具。 ["开启型，密闭型，保护型","保护型，密闭型，防水型","密闭型，开启型，防水型","密闭型，防水型，放爆型"] 什么是景天酸代谢途径？