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【简答题】
行星绕太阳S运行时，如图(a)所示，从近日点P向远日点A运行的过程中，太阳对它的引力做正功还是做负功?从远日点A向近日点P运动的过程中，太阳对它的引力做正功还是做负功?由此功来判断，行星的动能以及行星和太阳系统的引力势能在这两阶段运动中各是增加还是减少?
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【简答题】The 16 th century in England was a period of the breaking up of feudal relations and the establishing of the foundations of ____.
【单选题】The Tobacco ColoniesSixteenth-century England was a tumultuousplace. Because they could make more money from selling wool than from selling food, many of the nation’s landowners were converting farmer...
A.
During the 16th century, people were thinking highly of business.
B.
The food shortage of 16-century England was caused by converting to the sheep husbandry.
C.
In 1606, King James I gave the southern half to the Plymouth Company.
D.
Virginia was the first colony to receive slaves from Africa.
【单选题】The Tobacco ColoniesSixteenth-century England was a tumultuousplace. Because they could make more money from selling wool than from selling food, many of the nation’s landowners were converting farmer...
A.
During the 16th century, people were thinking highly of business.
B.
The food shortage of 16-century England was caused by converting to the sheep husbandry.
C.
In 1606, King James I gave the southern half to the Plymouth Company.
D.
Virginia was the first colony to receive slaves from Africa.
【单选题】The Tobacco ColoniesSixteenth-century England was atumultuousplace. Because they could make more money from selling wool than from selling food, many of the nation’s landowners were converting farmers...
A.
seeking gold
B.
growing tobacco
C.
feeding themselves
D.
none of them
【简答题】The 16 th century in England was a period of the breaking up of ____ relations and the establishing of the foundations of ____.
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