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已知在四面体ABCD中，E，F分别是AC，BD的中点，若AB＝2，CD＝4，EF⊥AB，则EF与CD所成的角的度数为（） A: 90° B: 45° C: 60° D: 30°

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image组件不支持（）图片格式。 A: JPG B: PNG C: SVG D: BMP

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刑法属于实体法，刑事诉讼法属于程序法。（　）data:image/png;bas...OU26AAAAAElFTkSuQmCC

image组件支持的图片格式包括()。 A: BMP B: JPG C: PNG D: SVG