同时也会受到令人不安的有关其震前准备工作水平的质疑的困扰。
It may also be troubled by unsettling questions about its level of pre-earthquake preparedness.
总结了其震兆特征的变化规律，并对该泉的映震效能进行了评价。
Next, the change principle of its earthquake precursor is summarized, and the reflecting earthquake ability is evaluated.
上击器采用液压原理，其震击力可由上提力的大小自由调节，但使用时不允许超过工具限定的最大负荷。
The up jarring section takes use of hydraulic mechanism, the jarring force can be adjusted according to up elevating load but can not exceed the max. load for tool load rated.
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