【单选题】辐射育种中应用最普遍的放射性 60 钴或 137 铯,它们产生的高能射线是()。
【简答题】a. (usu. before noun) not real or not made of natural things 人造的;人工的;假的
【简答题】A.Diet has nothing to do with health. B.The amount of food has something to do with health. C.Health depends on diet totally. D.Good food has nothing to do with health.
【简答题】a. (not before noun) wanting to do sth. 有...意向的;倾向于...的
【判断题】当测试三极管的正向特性时,集电极电源的“功耗限制电阻”旋钮应置于高阻挡。( )
【判断题】晶体管特性图示仪当测试三极管的正向特性时,集电极电源的“功耗限制电阻”旋钮应置于高阻挡。( )
【单选题】高精度的零件,一般在粗加工之后,精加工之前进行( ),减少或消除工件内应力。