经改造或重大维修的设备应当进行(),()方可用于生产。
参考答案:再确认;符合要求后
It has been announced that candidates(应考者) ________ remain in their seats until all the papers have been collected.
A.can
B.will
C.may
D.shall
低温回火的温度范围在150-250℃,降低应力,得到()组织,使钢材具有高的硬度、强度和耐磨性。
A.回火马氏体
B.回火托氏体
C.回火索氏体