【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
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【单选题】[选择题] Historically in North America, seismic design has emphasized the effects of horizontal gr
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m in places far north like Alaska and Canada. The movement of the aurora across the sky is usually s
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