Which of the following statements most accurately describes the risk element in investing?
A. Investment returns rise as risk rises.
B. The risks are always large.
C. Investment returns can be guaranteed and risk is irrelevant.
D. There is no risk in investing—you can always sell an investment.
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在委托—代理中,企业的所有者是委托人,企业的经理是代理人。()
A. 正确
B. 错误
若诊断为溃疡性结肠炎,纤维结肠镜主要发现为
A. 正常粘膜见于病变肠段之间
B. 粘膜呈卵石样有较深的沟槽样溃疡
C. 粘膜呈颗粒状,脆性增加,有糜烂与浅溃疡
D. 无假性息肉
E. 活组织检查可找到肉芽肿
易致痛经、闭经、崩漏、异位妊娠、产后腹痛、恶露不绝、不孕、癥瘕的是E.