支持疗法
参考答案：
主要是支持机体的抗病能力，增强各种功能活动的治疗方法。
An analyst does research about margin transaction. With respect to purchasing stocks using borrowed funds, the minimum equity percentage of the value of the asset that must be maintained by the investor is best described as the:（）
A. leverage ratio.
B. initial margin requirement.
C. maintenance margin requirement.
福美双对（）和（）有刺激作用。对鱼类有毒，对蜜蜂有毒。
