Shanghai is bigger than ____city in Japa

用己酸制备α-溴代己酸，反应式为______。

（5分）根据匀变速直线运动速度公式和位移公式推证：匀变速直线运动的速度和位移关系是

某校化学小组学生进行“气体相对分子质量的测定”的实验。操作如下：用质量和容积都相等的烧瓶收集气体，称量收集满气体的烧瓶质量，数据见下表(已换算成标准状况下的数值)。

已知标准状况下，烧瓶的容积为0.293 L，烧瓶和空气的总质量为48.4212 g，空气的平均相对分子质量为29。A、B、C、D、E是中学常见的气体。

(1)上述五种气体中，能够使品红溶液褪色的是(写化学式)________．

(2)D的相对分子质量是________。

(3)在标准状况下，11.2 L D气体中含有共用电子对的数目为________。

(4)A、B、C可能的化学式是________。

肺功能有障碍的外科病人应适当增加（）。

A.总热能摄入量

B.脂肪供能比例

C.糖类供能比例

D.维生素摄入量

E.蛋白质摄入量

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.