单项选择题图14-6为异步电动机不同极对数的电动机的特性曲线，极对数P1、P2的数值符合下面（）关系。<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/8789875_0.jpg"><br/> <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/8789875_0_1.jpg">