石油钻机的绞车一般设计成多个档位，各档的挂合和变更方法都不同。

Multi gears is commonly used for the winch of oil RIGS each with different gear changing method.

youdao

石油钻机的绞车一般设计成多个档位，各档的挂合和变更方法都不同。

Multi gears is commonly used for the winch of oil RIGS each with different gear changing method.

youdao