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问题 单项选择题

骨样骨瘤由以下哪两部分组成()

A．瘤巢和周围骨质硬化区

B．瘤巢和周围骨质破坏区

C．砂粒样物质和周围骨质破坏区

D．砂粒样物质和周围骨质硬化区

E．瘤巢和砂粒样物质

答案

参考答案：A

问答题

Describe with examples the lexical loss which occurred in Old English and Middle English. Do you think the loss of words inevitable What do you think of the process of lexical loss
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问答题 简答题

电视信心压缩的必要性是？
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