成功点解氢氧化钠得到金属钠的事哪位科学家（）

低承台对承台下桩身摩阻力的影响规律大致为( )。

A．对桩侧阻力有“削弱效应”，对桩端阻力产生“增强效应”

B．对桩侧阻力、桩端阻力均有“削弱效应”

C．对桩侧阻力有“增强效应”，对桩端阻力产生“削弱效应”

D．对桩侧阻力、桩端阻力均有“增强效应”

（10分）人们把截面如图所示的斜面体木料叫做楔。明朝年间，苏州的虎丘寺塔因年久失修，塔身倾斜，有倒塌的危险。有一位和尚把木楔一个一个地从塔身倾斜的一侧的砖缝间敲进去，结果扶正了塔身。假设和尚所用的木楔表面光滑、质量不计，木楔的一个角为θ，现在木楔背上加一压力F。求：

（1）力F按效果分解的平行四边形图示；（在答题卡的图示上作图）

（2）木楔对A侧压力和对B侧压力分别是多大？

读漫画《坐着说话不腰痛》。有人说：漫画中的两位男女青年是没有文化的。这里的“文化”是指

A．个人所具有的文化素养

B．人们接受文化知识教育的程度

C．人们的言谈表现

D．人们的行为表现

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.

以下不属于解放后的代表作的是（）。

A.《梁祝》

B.《江姐》

C.《黄河大合唱》

D.《黄河》