The I type shear blocks dowelled bidirectional hollow plates (I SBDBHPs) are the most widely used.

键式双向空心大板中Ⅰ型板（简称Ⅰ型空心大板），是该类空心大板中使用多一种板型。

This paper puts forward a new type of bolted anti-creepers, which changes the fixture mode of the dowelled anti-creeper.

提出了一种新型螺栓式钢轨防，改变了穿销式防紧固方式。