A.對(duì)應(yīng)橫擔(dān)的上方,緊靠橫擔(dān) B.對(duì)應(yīng)橫擔(dān)的下方,距橫擔(dān)100mm C.對(duì)應(yīng)橫擔(dān)的下方,距橫擔(dān)150mm D.對(duì)應(yīng)橫擔(dān)的下方,距橫擔(dān)200mm