某船电磁计程仪指示的航速为12kn,计程仪改正率ΔL=0%,当时流速为3kn,试问顶流时该船对水速度是多少?A.15knB.12knC.9knD.3kn
某船电磁计程仪指示的航速为12kn,计程仪改正率ΔL=0%,当时流速为3kn,试问顶流时该船对水速度是多少?
A.15kn
B.12kn
C.9kn
D.3kn
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