A:北面
B:西北
C:东北
Gangnam Style was issued in the middle of July last year, then it ____.
从含碘的有机溶液中提取碘和回收有机溶剂,需要经过蒸馏,指出下面蒸馏装置图中的错误之处.
① ____;
② ____;
③ ____.