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【单选题】
稀有气体氙能与下述哪种元素形成化合物A.
钠
B.
氦
C.
溴
D.
氟
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【单选题】听力原文： If a city ever needed tall buildings in a hurry, it was Chicago in the 1880s. Located in the center of America's farmland, with rail links to every coast, it was the natural hub of commerce for ...
A.
They used bricks and they are too heavy.
B.
They used bricks that were too expensive.
C.
Steel was in short supply.
D.
The benefits of steel were unknown to them.
【简答题】The house style that dominated American housing during the 1880s and 1890s was known as Queen Anne, a curious name for an American style. The name was, in fact, a historical accident, originating with...
【单选题】若有定义int a[10],*p;则不能使p指向数组元素a[5]的赋值语句是_____。
A.
p = a+5;
B.
p = &a[5];
C.
p = *(a+5)
D.
p = a; p+=5;
【简答题】读下图，完成下列问题。 （1）画出北半球夏至日太阳照射地球示意图，并用阴影表示黑夜。 （2）画出黄赤交角（用θ表示），并注明度数。 （3）这一天A地正午太阳高度是_______，南极圈上的正午太阳高度是______。北极圈上昼长时间为____ _______小时。南极圈上昼长时间为____________小时，赤道上昼长时间为_____________小时。 （4）当太阳直射点自赤道向北移动到A点...
【单选题】下列哪一反应的 代表KBr(s)的晶格能U( )
A.
K + (g)+Br - (g)→KBr(s)
B.
K(s)+1/2Br 2 (l)→KBr(s)
C.
K + (g)+Br - (g)→KBr(g)
D.
KBr(s)→K + (g)+Br - (g)
【单选题】When did the weather recordkeeping begin?
A.
In 1990s.
B.
In 1880s.
C.
In 1994.
D.
In 2002.
【单选题】The working conditions of skilled workers in the meat-packing industry during the 1880's were influenced by
A.
the efforts of social workers to improve sanitation in the packinghouses.
B.
improvements in the industry's packing process that occurred in the 1880's.
C.
the workers' ability to perform. the industry's complex tasks.
D.
the workers' determined complaints about the rate and conditions of their work.
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