气相色谱分析对检测器有何要求?
拆修制冷压缩机的专用工具是指()、油缸顶丝、拆卸联轴器的专用扳手。 ["丝扣","丝杠","丝头","吊栓"]
渗碳用钢通常采用()钢。 ["35CrMnSiA","5CrNiMo","20CrMo","38CrMoAlA"]
以下哪项工作能提高车间的效率和效益?() ["客户预约","道路救援","接待与定损","作业安排","目录式报价"]
T10A刀具的最终热处理是() ["淬火","等温淬火","淬火+中温回火","淬火+低温回火"]
石油产品的炼制工艺程序及目的是什么?