A user reports that their UPS is making a loud beeping sound. Which of the following would cause this problem?（）

[问答题]设a0＝0，a1＝1，an＋1＝an＋2an－1（n＝1，2，…），　　（1）导出f（x）满足的微分方程；　　（2）证明：f（－x）＝－e－xf（x）。

[判断题]到消毒得不到保证的医院、诊所打针、拔牙或手术有可能传播艾滋病。

[单选题]生活污水量约占生活用水量的（　）。

[单选题]记录发生在员工身上的特别有效或无效的工作行为，然后以此作为绩效评估的事实依据，这种绩效考核方法是()。

[单选题]不属于避孕和绝育的是（）

[多选题]进站、出站、进路信号机，当（）时，均视为停车信号。

[单选题]朝鲜族把（）哪种动物作为长寿、幸福的象征，民族的图腾？

[单选题]月经后期，量少色淡是：（）

[单选题]该患者水、电解质情况为（　　）。

[单选题]郁李仁具有的功效是：（）

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