根据力的作用效果可以感知力的存在.以下事例中不能说明力能改变物体形状的是( )

题型:选择题

问题:

根据力的作用效果可以感知力的存在.以下事例中不能说明力能改变物体形状的是(  )

A.人推墙时,感到墙也在推人

B.飞来的网球让球拍的线变弯了

C.用力折纸,会留下折痕

D.正在称物体重力的弹簧测力计的弹簧

考点:力的作用效果
题型:选择题

下列植物中,生殖摆脱了水的限制的是(  )

A.藻类植物

B.蕨类植物

C.种子植物

D.苔藓植物

题型:选择题

金腰燕等燕科动物的唾液腺最发达,所筑的巢称为燕窝。()

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如图所示,电子从静止开始,被U1=1000V的电压加速,然后垂直进入场强E=500N/C的匀强偏转电场,已知偏转电极长L=6cm,求:

(1)电子被U1加速后的动能,

(2)电子离开偏转电场后速度与水平方向夹角地正切.

题型:选择题

Bernard Bailyn has recently reinterpreted the early history of the United States by applying new social research findings on the experiences of European migrants. In his reinterpretation, migration becomes the organizing principle for rewriting the history of pre-industrial North America. His approach rests on four separate propositions.

The first of these asserts that residents of early modern England moved regularly about their countryside.- migrating to the New World was simply a "natural spillover". Although at first the colonies held little positive attraction for the English they would rather have stayed home--by the eighteenth century people increasingly migrated to America because they regarded it as the land of opportunity. Secondly, Bailyn holds that, contrary to the notion that used to flourish in American history textbooks, there was never a typical New World community. For example, the economic and demographic character of early New England towns varied considerably.

Bailyn’s third proposition suggests two general patterns prevailing among the many thousands of migrants: one group came as indentured servants, another came to acquire land. Surprisingly, Bailyn suggests that those who recruited indentured servants were driving forces of transatlantic migration, These colonial entrepreneurs helped determine the social character of people who came to pre-industrial North America. At first, thousands of unskilled laborers were recruited: by the 1730’s, however, American employers demanded skilled workers.

Finally, Bailyn argues that the colonies were a half-civilized hinterland of the European culture system. He is undoubtedly correct to insist that the colonies were part of the Anglo-American empire. But to divide the empire into English core and colonial periphery, as Bailyn does, devalues the achievements of colonial culture. It is true, as Bailyn claims, that high culture in the colonies never matched that in England. But what of seventeenth-century New England, where the settlers created effective laws, built a distinguished university, and published books Bailyn might respond that New England was exceptional. However, the ideas and institutions developed by New England Puritans had powerful effects on North American culture.

Although Bailyn goes on to apply his approach to some thousands of indentured servants who migrated just prior to the revolution, he fails to link their experience with the political development of the United States. Evidence presented in his work suggests how we might make such a connection. These indentured servants were treated as slaves for the period during which they had sold their time to American employers. It is not surprising that as soon as they served their time they gave up good wages in the cities and headed west to ensure their personal independence by acquiring land. Thus, it is in the west that a peculiarly American political culture began, among colonists who were suspicious of authority and intensely anti-aristocratic.

What does the author think of Bailyn’s work()

A. Bailyn underestimates the effect of Puritan thought on North American culture

B. Bailyn overemphasizes the economic dependence of the colonies on Great Britain

C. Bailyn’s description of colonies as part of an Anglo-American empire is misleading

D. Bailyn failed to test his proposition on a specific group of migrants to colonial North America

题型:选择题

痹证的"皮肤不营"表现为()

A.干燥

B.皲裂

C.不仁

D.屈不伸

E.畏寒

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