职工应当参加基本养老保险，由用人单位和职工共同缴。无雇工的个体工商户、未在用人单位参加基本养老保险的非全日制从业人员以及其他灵活就业人员可以参加基本养老保险，由个人缴纳基本养老保险费。
慢性疲劳症（） 指健康人不明原因地出现严重的全身倦怠感。 伴有低热、头痛、肌肉痛、抑郁、注意力不集中等精神症状。 有时淋巴结肿大而影响正常生活的一种临床综合症。 全身肢体动作放慢。
不存在其他药物时，吲哚洛尔通过激动p受体致心率增高。但在高效日受体激动剂存在情况下，吲哚洛尔引起剂量依赖性心率降低。因此吲哚洛尔可能是（） 不可逆性拮抗剂。 生理性拮抗剂。 化学拮抗剂。 部分激动剂。 非竞争性拮抗剂。
What does the Web Session Affinity feature of Active GridLink for RAC provide?（） It mandates that HTTP sessions must be stored in an Oracle RAC database for the highest throughput and availability.。 It pins a connection to the thread associated with a web session such that subsequent connection reservations are significantly faster.。 It stores a reference to the connection associated with an HTTP session in the session object.。 It allows developers to modify how their web application reserves and releases database connections to allow enhanced performance.。 It provides improved performance by associating a database connection with an HTTP session.&e。
国务院和省、自治区、直辖市人民政府建立健全社会保险基金监督管理制度，保障社会保险基金安全、有效运行。
The loss of the control file forced you to re-create the control file. After re-creating it and opening the database， you find that some of the data files are named as MISSINGnnnnn， where nnnnn is a five-digit number starting with 0. What could be the possible reason？（）
