How long the gyrocompass course can become stable usually after the gyrocompass is switched on? A. 10 min B. 20 min C. 30 min D. 4 hoursA、aB、bC、cD、d-易过题库-题库最全的搜题网站

How long the gyrocompass course can become stable usually after the gyrocompass is switched on? A. 10 min B. 20 min C. 30 min D. 4 hours

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