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To us it seems so natural to put up an umbrella to keep the water off when it rains.But actually the umbrella was not invented as protection.against the rain,It was first used as a shade against the sun! (42)Nobody knows who first invented it but the umbrella was used in very ancient times.Probably the first to use it were the Chinese,way back in the eleventh century B C.We know that the umbrella was also used in ancient Egypt and Babylon as a sunshade. (43) And there was a strange thing connected with its use--it became a symbol of honor and authority.In the Far East in ancient times,the umbrella was allowed to be used only by royal people or by those in high office.n Europe,the Greeks were the first to use the umbrella as a sunshade.And the umbrella was in commonly use in ancient Greece. (44) But it is believed that the first persons in Europe to use the umbrellas as protection against the rain were the ancient Romans.Duringthe Middle Ages,the use of the umbrella practically disappeared.Then it appeared again in Italy in the late sixteenth century.And again it became a symbol of power and authority. Umbrellas have hot changed much in style. during all this time,though they have become much lighter in weight. (45) It wasn’t until the twentieth century that women ’s umbrellas began to made in a variety of colors. 41___________________________________________ 42___________________________________________ 43___________________________________________ 44___________________________________________ 45___________________________________________
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【单选题】所有者权益在数量上等于企业的( )。
A.
全部资产减流动负债
B.
原有资金
C.
流动资产减流动负债
D.
全部资产减全部负债
【简答题】标准规定:形位注出公差有()个公差等级,其中()级精度最高;形位未注公差分为()个公差等级,它们分别为()、()和()
【判断题】质点角动量定理可认为是牛顿运动定律的推论,但比牛顿运动定律适用范围更广。
A.
正确
B.
错误
【单选题】产品处于生命周期的成熟后期,广告的策略是( )
A.
告知
B.
提醒
C.
说明
D.
劝说
【单选题】对零件的配合、耐磨性和密封性等有显著影响的是:( )。
A.
尺寸精度
B.
表面粗糙度
C.
形位公差
D.
互换性
【判断题】产品处于生命周期的成熟后期,广告的策略是告知
A.
正确
B.
错误
【简答题】惯性系中质心动能方程和角动量方程 惯性系中由牛顿第二定律可得质点的动能定理和角动量定理,惯性系中由质心运动定理也可得相应的质心动能方程和角动量方程,试导出之.再为质心动能方程编制计算实例。
【单选题】1918年天鹰座新星的亮度达到了-1.1等,超过了()。
A.
织女星
B.
天狼星
C.
金星
D.
木星
【简答题】质点的动量、角动量和动能是否与惯性系的选取有关?功是否与惯性系有关?质点的动量定理和动能定理是否与惯性系的选取有关?
【判断题】产品处于生命周期的成熟后期,广告的策略是劝说
A.
正确
B.
错误
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