备用: reserve; spare; alternate; b ...时间: time; hour海上备用时间: spare time at sea维护备用时间: maintenance standby time维修备用时间: stand-by maintenance time钻机备用时间: standby rig time启动备用时钟: activate a standby clock不可用时间: down time; unavailable time插用时间: time scramble; time search后作用时间: after effect time借用时间: borrowing time军用时间: military time堪用时间: working time (life)可使用时间: postion; pot life; serviceable time; up-time可用时间: availability time; available time; available working time; pot life; serviceable time; uptime; usable life; usable time; utime可用时间比: serviceability ratio可运用时间: up time利用时间: utilization time民用时间: civil time施用时间: time of application实用时间: utility time使用时间: elapsed time; hours of use; service time; time of service; time of usage; utility time停用时间: down time未使用时间: unemployed time; unused time未用时间: time unused; unused time