系统设计的依据是 【4】 。

下列算式中，得数是0的是（　　）

A．8÷0

B．804÷（75-75）

C．（75-75）÷804

D．612÷（21-3×7）

职业道德是指从事某种职业的人员在工作和劳动过程中所应遵守的与其职业活动紧密联系的______和原则的总和。

一患者缺失，间隙正常，银汞充填体，已作牙髓治疗，位置正常，与下颌对牙的覆覆盖关系正常，以下修复设计中最合理的是（）

A.双端固定桥

B.粘结固定桥

C.单端固定桥

D.直接作可摘局部义齿

E.全冠修复后制作可摘局部义齿修复

Thank you all. Thank you. Thank you so much. Thank you. And it is, as always, such a personal pleasure for me to join this remarkable gathering. And I look out at this audience and there are just too many people here who deserve recognition to name all of you, so let me just express my deep appreciation to all the representatives of foreign governments as well as the leaders and advocates who are here with us and who will be sharing the stage. And of course, I do want to thank someone very special, namely my husband, for organizing this event – (applause) – and instilling it with his very special spirit of activism, innovation, and commitment that is contagious.

按照《五金交电家电化工商品的购销合同实施办法》规定，供方错发到站、中转单位、收货单位及接货人，与需方同城的，由需方就近解决。供方应承担（）。

A、违约金

B、货物损失

C、由此造成的损失和费用

D、中国人民银行规定的罚金