试题详情

【单选题】[选择题] Historically in North America, seismic design has emphasized the effects of horizontal ground motion because the horizontal components of an earthquake usually exceed the vertical components and because structures are usually much stiffer and stronger in response to vertical loads than they are in response to horizontal loads. (stiffer是什么意思?)

A倾斜的

B坚硬的

C弯的

D倒伏的