淬火+高温回火的组织是（） ["回火马氏体","回火屈氏体","回火索氏体","珠光体"]
国家实行（）的认证认可监督管理制度。国家对认证认可工作实行在国务院认证认可监督管理部门统一管理、监督和综合协调下，各有关方面共同实施的工作机制。 ["统一","分别","协调","全面"]
To avoid excessive pressures in the fuel oil filling system during bunkering, you should （）. ["close the tank filling valves quickly","top off all tanks at the same time","rill completely all tanks to less than 95% full","reduce the loading rate when topping off"]
意大利的地理位置对其经济发展有何重要意义？
中国古代戏曲的三大特点是（）。 ["写实性","综合性","程式化","虚拟化"]
请指出焊接接头的焊接缺陷包括哪几个方面？
