题目内容
按照构件类型柱可以分为（）。
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Skimming means reading quickly to get the main idea of the text.
Scanning means to read to located general information.
The key point in scanning is that the reader has something in his mind and he should ignore the irrelevant parts when reading.
请说出“47,XX,+21”所表示的病名,及其发生原因和主要临床特征?
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