由连接管(1)与罩体(2)构成，罩体(2)与连接管(1)是以非气密性的螺纹相连接。
The movable sucking cover is composed of a connecting pipe (1) and the cover body (2), and the cover body (2) and the connecting pipe (1) are connected through threads of non air tightness.
由连接管(1)与罩体(2)构成，罩体(2)与连接管(1)是以非气密性的螺纹相连接。
The movable sucking cover is composed of a connecting pipe (1) and the cover body (2), and the cover body (2) and the connecting pipe (1) are connected through threads of non air tightness.
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