指数基金基本上可以消除投资组合的非系统性风险。
参考答案：对
He waited until it was dark ____ nobody could see him clearly.
A．so that
B．in order to
C．although
D．However
髋关节外展时ROM的正常值是（）
A.0°～25°
B.0°～30°
C.0°～45°
D.0°～90°
E.0°～180°
