horizontal return tubular boiler 卧式回管锅炉
horizontal return tubular combi boiler 卧式回管锅炉
·2,447,543篇论文数据，部分数据来源于NoteExpress
The vertical axis (Y axis) is the compounded portfolio return and the horizontal axis (X axis) is portfolio risk as measured by the annual standard deviation of return.
FORBES: Basics of Asset Allocation (Part 2 of 2)
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