【简答题】Fill in each blank with proper word form. The purpose of training __________ (qualify) teacher for those mountain areas is worthy of praise. Her __________ (yze) of the accident exactly showed wha...
【单选题】For the circular arch structure shown in the figure, the radius of the arch is R. When subjected to the load shown in the figure, the horizontal reaction force of support B is:【图片】
【简答题】The ____ relation is the relation of substitutability, which is a relation between elements r____ with each other at a particular place of a structure.