根据实用化要求,地区电网调度自动化系统应具备哪些基本功能?
水泥砼加热型填缝料有()。 ["A、沥青玛蹄脂类 ","B、橡胶沥青类 ","C、乳化沥青橡胶类 ","D、聚(氨)脂类"]
某感应电动机额定转速为nN=980r/min,该电机的极对数及额定转差率分别为:() ["A、6,0.03","B、3,0.02","C、3,0.04","D、4,0.03"]
桥梁计算时用履带荷载验算,下列不予考虑()。 ["结构重力","冲击力","人群荷载","砼徐变力"]
什么是数字滤波?
什么是问答传送方式?