你们必须卸掉井口大螺栓。

You must break out all the large bolts on the wellhead.

youdao

螺栓式、低压、中高压、大容量、耐大纹波电流产品。

Screw , low, Middle and High Voltage, Large Capacity, High Ripple Current.

youdao

螺栓式、低压、中高压、大容量、耐大纹波电流产品。

Screw , low, Middle and High Voltage, Large Capacity, High Ripple Current.

youdao