单项选择题 According to MLC,the minimum hours of rest shall not be less than 10 hours in any 24-hour period,and（）hours in any seven-day period.

单项选择题 （）directly affect the fitness and ability of a seafarer to perform watchkeeping duties.

单项选择题 Malacca Strait is 805 km（）and（）from 64 km in the S to 257 km in the N.