The primary components of the system are a connection device made from PVC and polystyrene foam.
主要组成部分的系统是一个连接装置由聚氯乙烯和聚苯乙烯泡沫塑料。
2
It should be emphasized in drawing up new specifications that the method of supplying foam by catenary suspension and flexible connection is also adaptable.
在制定新规范时，应说明悬链和柔性连接供应泡沫的方法也是可以采用的。
3
This invention relates to a washing device which is characterized in that a connection valve is provided which can prevent abluent foam from overflowing outside.