单项选择题 <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/8790417_0.jpg"><br/> <br/> 产生最大转差功率损耗系数时的转差率S1与系数α的关系表达式为（）。<br/> <br/> <br/> <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/8790417_0_1.jpg">