我研究着空心天花板上的一个污点。
聚丙烯波形板坚韧而空心的结构使之可以很容易地弯折和切割。
The toughness and hollow structure of Polypropylene Corrugated Sheet can easily be bent and cut.
采用空心轴和板簧与用户直接安装。
Connected with service shaft by hollow shaft and plate spring directly.
一水土分隔网板，系配置于上述空心管之上方；
The water and soil separation net plate is matched above the hollow pipe;
一水土分隔网板，系配置于上述空心管之上方；
The water and soil separation net plate is matched above the hollow pipe;
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