operation free-running operation 自由航行
free running operation 空车运行自由振荡状态
free-running operation 自由振荡 ; 自由运行
casing running operation 下套管作业
Engine Starting and Running Operation 柴油机起动和运转
Running the operation - value 运行操作
running tunnel in operation 运营地铁区间
running-in operation 磨合运转
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