单项选择题

直肠 A.
为结肠的末端 B.
于骨盆上缘处续乙状结肠 C.
盆膈以上称骶曲 D.
会阴曲凸向后方 E.
骶曲凸向后方

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Please answer these questions after you watch the video on Xiaomi Eyewear . What is the core of this technology ?
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A customs union eliminates trade barriers between member countries and adopts a common external trade policy. （ ）A.对B.错
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