如果钢瓶阀门难于操作，停止使用并同供应商联系。

Discontinue use and contact the supplier if a cylinder valve is difficult to operate.

youdao

如果钢瓶阀门难于操作，停止使用并同供应商联系。

Discontinue use and contact the supplier if a cylinder valve is difficult to operate.

youdao