单选题In an open lifeboat，the lifeboat compass is usually（）.Aplaced in a fixed bracket when being usedBclamped to any position convenient for the coxswain to see itCpermanently mounted on the lifeboat's centerlineDmounted in the center of the boat to eliminate deviation
单选题
In an open lifeboat，the lifeboat compass is usually（）.
A
placed in a fixed bracket when being used
B
clamped to any position convenient for the coxswain to see it
C
permanently mounted on the lifeboat's centerline
D
mounted in the center of the boat to eliminate deviation
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