供货商及运输情况变化,影响材料按时到货,()材料计划。 ["A、不必调整","B、局部调整","C、视需要调整","D、应调整"]
4004的运算时钟频率是 ["10.8KHz","108KHz","10.8MHz","108MHz"]
当热电偶补偿导线短路时,温度表指示为()。 ["(A)最小值","(B)外界温度","(C)中间值","(D)最大值"]
励磁系统应保证同步发电机端电压的静差率不大于()。 ["±0.5%","±1%","±1.5%","±2%"]
外部存储器区别于内部存储器的最大特点是() ["容量大","速度快","易携带","价格低廉"]
橡胶加工助剂