The development, installation, and operation of the pig trap for small diameter pipeline is introduction.
介绍了小口径管道清管器收发球装置的研制、安装及其工作原理。
Thee mouse turned to the pig, "I am so sorry Mr. Mouse, but the trap is no concern of mine either!" the pig said.
老鼠转向猪。“我也很抱歉，老鼠先生，老鼠夹和我也没有任何关系。”小猪说道。
The mouse turned to the pig, "I am so sorry Mr. Mouse, but the trap is no concern of mine either! " the pig said.
老鼠转向猪。“我也很抱歉，老鼠先生，老鼠夹和我也没有任何关系。”小猪说道。
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