单项选择题( ) are the advantages associated with entering a market early. A. Pioneering advantages B. First-mover advantages C. Core competencies D. Late-mover advantages
单项选择题HZ10系列组合开关的额定电流一般取电动机额定电流的( )。 A. 1~1.5倍 B. 1.5~2.5倍 C. 2.0~3.0倍 D. 3.5~5倍