关于拔牙时患者的体位下列哪些是正确的 （）

A.在拔牙过程中应使患者处于一种自然舒适的体位

B.拔除下颌牙时患者张口时下颌牙平面应与地面平行

C.拔除下颌牙时，患者下颌应与术者肘关节在同一高度或稍低

D.拔除上颌牙时患者头稍后仰，上颌牙面与地面呈45°

E.拔除上颌智齿时患者头尽量后仰，上颌牙面与地面呈60°

While the examination is being carried out, ______ shall be present and responsible for moving the goods, opening and restoring the packing.

A. the consignee of the import goods and the consignor of the export goods
B. Customs officer
C. harbour officer
D. the owner of the ship