皮皮学，免费搜题
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【简答题】
中国是一个有着 5000 多年悠久历史的文明古国。长期以来，中国人民以自己的勤劳智 慧创造了灿烂的中华文明，为人类文明进步作出了重大贡献。北京就是一座有 3000多年悠久历史的文明古城，800多年前北京开始建都。//离今晚会场人民大会堂不远的地方，就是举世闻名的故宫。故宫始建于600年前，是世界上现存最大最完整的古代宫殿建筑群。从历史悠久的北京和建筑精美的故宫这些缩影中，人们就能够生动地感受到中华文明源远流长、博大精深的深厚底蕴，感受到中华民族自强不 息、顽强奋进的壮阔历程。//
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举一反三
【单选题】Internal scale economies occur when:
A.
expansion of output by a firm leads to greater specialization of labor.
B.
expansion in an industry drives down the input prices.
C.
industry growth leads to a greater diffusion of knowledge among firms.
D.
a firm pays higher input prices to expand production.
【单选题】Internal scale economies occur when:
A.
Firm growth leads to more specialization by workers.
B.
Industry growth gives rise to better input markets.
C.
Industry growth leads to a greater diffusion of knowledge among firms.
D.
Firm growth drives up prices of some of the firm’s inputs.
【单选题】B类网络的缺省子网掩码为( ). (3分)
A.
255.255.255.255
B.
255.255.255.0
C.
255.255.0.0
D.
255.0.0.0
【单选题】When is the internal temperature of a large desert mammal lowest?
A.
Just before sunrise.
B.
In the middle of the day.
C.
Just after sunset.
D.
Just after drinking.
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