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【判断题】
边界可以是真实存在的，也可以是假想的，还可以是移动的。A.
正确
B.
错误
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皮皮学刷刷变学霸
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【简答题】阅读理解。 In the United States, there were some well-constructed houses for native Indians, ranging from the brush shelter to the five-storied pueblo. In the eastern United States, one of the exist...
【单选题】某反应的活化能 E a 越大,速率系数 k 越小,温度升高, k 变 ( ) ,反应物浓度增大, k ( )
A.
大 大
B.
B. 小 大
C.
C. 大 不变
D.
D. 小 不变
【单选题】The first coins to appear in the Western world were issued by the Indians and the Ionian Greeks in the eighth century B. C. These coins, which were made of electrum, a natural combination of gold and ...
A.
available in quantity
B.
inferior in workmanship
C.
irregular in shape and size
D.
made out of inexpensive metal
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