题目：
三相交流电各相最大值，频率祖同。相位差120度。（）
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C解析：月经期在l0天左右说明月经期延长，贫血与此有关。考虑黄体萎缩不全，子宫内膜不规则脱落导致月经期延长。
三相交流电各相最大值，频率祖同。相位差120度。（）
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