预应力混泥土先张法施工()。
A、须留孔道和灌浆
B、张拉时摩阻力大
C、适于构件厂生产中小型构件
D、无须台座
参考答案:C
The goals of this project are to promote the commercialization of home-use robots, whose market is
smaller than _______ for industrial robots, and to develop safety technologies and standards.[ ]
A. it
B. them
C. that
D. one
入磨物料水分大,通风()时,易造成()、()饱磨等现象