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Information and resources to help employers create healthy, high-performing workplaces. The APA Center for Organizational Excellence is a public education initiative from the American Psychological Association designed to educate the employer community about the link between employee health and well-being and organizational performance.

在线安全期计算器。只需要输入上一次月经时间和月经周期，便能够以日历形式直观的获得安全期和危险期，以帮助您安全期避孕。上次月经时间 月经周期 最短月经周期 最长月经周期 如果您的月经周期不是28天，请设置您的周期，再计算！