A device for cutting ovals or circles in sheet material.
为椭圆或圆形切割的板材设备。
Said invention uses the electroplating method to prepare the thin copper-clad invar sheet material.
本发明是利用电镀法制备薄覆铜因瓦片材。
In the bonded experiments, the concrete surface treatment; sheet material quantity and material kind were studied.
在片材与混凝土的粘贴试验中,分别对混凝土表面处理、片材数量及种类进行了研究。
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