倒垂线的测线宜采用强度较高的不锈钢丝或不锈钢丝, 其直径的选择应保证极限 拉力大于浮子浮力的( D )。
A.
1.5
B.
2.0
C.
2.5
D.
3.0
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【单选题】43 Which of the following networking methods allows us to show that the last 10% of one element cannot be completed until 62% of a previous element has been completed?