边坡地表排水沟主要为防止（）。 ["地表水冲坏运输道路","地表水淹没采场","地表水流进边坡岩体表面裂隙中"]
What is the maximum number of 220V power supplies that can be in a UCS chassis?（） ["two","four","twice the non-redundant configuration required to power the chassis","three times the non-redundant configuration required to power the chassi"]
在险价值法（VAR）
信号灯显示中，用“（）”表示禁止。 ["→","╳","!","？"]
简述期权价格制定的依据。
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