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【单选题】
无风流情况下测定计程仪改正率ΔL,已知两组横向测速标之间的距离为2n mile ,若所得计程仪读数差 为1.9n mile ,则相应的计程仪改正率ΔL为_____ 。
A.
+ 5.0 ％
B.
- 5.0 ％
C.
+ 5.3 ％
D.
- 5.3 ％
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