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【判断题】
“新企业的加入困难，风险大，投资大”是寡头垄断市场的特点之一。A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【简答题】氮质血症 (azotemia)
【单选题】According to the passage, it is difficult to interpret the results of certain treatments for SARS because______.
A.
patients were in different countries .
B.
patients were given medicines in widely different settings
C.
patients were at different stages of the illness
D.
these conditions had no standardized measurements or controlled situations
【简答题】氮质血症(azotemia)(名词解释)