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问题
单项选择题
堤岸防护工程的检查内容有：（）有无松动、塌陷、架空、垫层淘刷等。
A.砌缝
B.砌体
C.填土
D.勾缝
答案
参考答案：B
选择题
Here are the photos
in Beijing.
A. who are taken
B. that took
C. which I was taken
D. that were taken
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问答题 简答题
为何在凌晨较容易看到流星？
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