- non-periodic overhaul
- 不定期: irregularly scheduled; non s ...
- 检修: examine and repair; overhaul ...
- 定期检修: cycled recondition; periodic inspection; periodic overhaul; periodic repair; periodical repair; periodical servicing; prophylactic repair; regular overhauling; regular repair; scheduled maintenance
- 不定期检查: casual inspection; irregular inspection
- 不定期检验: nonperiodic inspection
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