简述在Excel工作簿中设置页眉和页脚的三个步骤。

心源性水肿者，其水肿常先出现的部位是（）.

A.眼睑

B.下肢

C.全身

D.胸腔

E.腹腔

由于外界条件的变化而影响了建筑物效用的发挥，导致其价值贬损，属于( )。

A．自然损耗

B．功能损耗

C．经济损耗

D．无形损耗

固定义齿修复时，固位体设计应注意的问题有（）

A.提高固位体的固位力

B.基牙两端的固位体固位力基本相等

C.固位体固位力的大小应与力的大小、桥体的跨度和桥体的曲度相适应

D.固位体之间的共同就位道

E.基牙牙冠缺损的固位体设计

变压器的匝数与变比（）

A、不成比例

B、成反比

C、成正比

D、无关

Many animals engage in play，but homo sapiens is the only animal (1) have invented sports.Since sports are an invention，a part of culture (2) than an aspect of nature，all definitions of sports are somewhat arbitrary. (3) sports are a human universal found in every known culture or a (4) unique to modern society depends upon one’s definition of sports.Men and (5) have always run，jumped，climbed，lifted，thrown， and wrestled，but they have (6) always performed these physical activities competitively. Although all literate societies seem to (7) contests of one sort or another in which men， and sometimes women， (8) in displays and tests of physical skill and prowess，sports may be (9) defined as physical contests performed for their own sake and not for (10) ulterior end.According to this strict definition，neither Neolithic hunters nor contestants (11) religious ceremonies such as the ancient Olympic Games were engaged in sports. (12) on the stipulation that sports must be performed for their own sake (13) the paradoxical elimination of many activities which are usually thought of as (14) ，such as exercises done for the sake of cardiovascular fitness，races run (15) satisfy a physical education requirement，ball games played to earn a paycheck. (16) definition also means abandonment of the traditional usage in which"sport，"derived (17) Middle English disporter，refers to any light hearted recreational activity.In the. (18) of some 18th- century aristocrats，a game of backgammon and the seduction of (19) milkmaid were both considered good sport，but this usage of the term (20) become archaic.