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【单选题】
The author compared Trobriand Islanders and the Yanomani to imply that ______.A.
they were in a regional exchange network called the kula ring
B.
they were both manufacturing handcrafts
C.
they were located where raw materials were available
D.
their specialization had much to do with social and political environment
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【简答题】水玻璃的模数是指水玻璃中____________和__________摩尔数之比。常用水玻璃的模数为___________。
【单选题】某不可压缩流体在水平变径圆管中作定态流动,若截面 A 和截面 B 处的管径之比为 1:3 ,则流体在截面 A 和截面 B 处的平均流速之比为()
A.
1:3
B.
9:1
C.
1:9
D.
3:1
【简答题】依法治国是实现国家长治久安的重要保障。 判断对错
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