您多长时间试验一次救生艇机？谁负责操纵艇机？谁负责维护和修理艇机？
How often should you test lifeboat engine? Who takes charge of the operation? Who takes of maintenance and repair work?
您多长时间试验一次救生艇机？谁负责操纵艇机？谁负责维护和修理艇机？
How often should you test lifeboat engine? Who takes charge of the operation? Who takes of maintenance and repair work?
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