______is the speed of a vessel allowing time for effective action to be taken under prevailing circumstances and conditions to avoid a collision and to be stopped within an appropriate distance．A.Safe speedB.Economic speedC.Proper speedD.Navigation speed
______is the speed of a vessel allowing time for effective action to be taken under prevailing circumstances and conditions to avoid a collision and to be stopped within an appropriate distance．
A.Safe speed
B.Economic speed
C.Proper speed
D.Navigation speed
相关考题：
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