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【单选题】
倒垂线测线宜采用强度较高的不锈钢丝或不锈丝，其直径的选择应保证极限拉力大于浮子浮力的：
A.
2倍
B.
2.5倍
C.
3倍
D.
4倍
拍照语音搜题，微信中搜索"皮皮学"使用
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【简答题】If the impact factor of a journal in 2017 is 1.5 and there are 2000 articles published on this journal from 2015 to 2016, these articles have been cited for totally (number)times in 2017.
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