... 杆式分厘卡；杆式测微器 stick micrometer 刚性梁 stiff beam 刚性 stiffness ...
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For (sub -) stiff beam-soft half space systems, wave speeds in beam are not critical any longer, but there is still a minimum critical velocity.
对(次)硬梁-软半空间系统，梁的波速不再是临界速度，但也存在一个最小临界速度。
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