Analysed the key to technical question of low-voltage ZNR.
分析了低压压敏陶瓷工艺技术的关键问题。
Therefore, how to prevent and control the shifting sand, is a technical key question, which should be solved in the sub-base earthwork.
为此如何防治流砂成为基坑土方施工需要解决的一个技术难题。
On the basis of that, two key technical issues- exam question bank and paper drawing are discussed, in order that a theoretical basis is provided for further research into the field.
在此基础上，对出卷活动中的两个关键技术———题库和抽取试卷进行了论述。
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