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问题
填空题 简答题
稻谷的清理方法主要有(),(),()和()。
答案
参考答案:
筛选法;风选法;密度分选法;磁选法
选择题
Earth is believed _____ by an object the size of Mars at some point in the distant past before its surface cooled.
A. to be hit
B. to have hit
C. to have been hit
D. to hit
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填空题
城市方言学研究可以以()为代表。
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