An auto on line safety valve checking and adjustment system is developed to solve the problems of poor degree of accuracy and slow speedy that exists in the man made system.
针对现行人工在线校验安全阀存在的校验准确度差、速度慢等问题，研制了自动在线安全阀校验整定系统。
I had an auto-repair man once.
我过去有位汽车修理师。
I had an auto-repair man once.
我过去有位汽车修理师。
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