气泡水准仪;钳位信号电平;平放水准器

block level的用法和样例：

例句

This method is also suitable for the theodolite with a contract index level.这个方法也适合于一般具有竖盘符合水准器的经纬仪。

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keep from ; stop from ; block from;

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Sorry,there is not text temporarily, Please help tingroom to look for it! 如果您能找到更好的听力原文，请发贴到听力原文收集区，您将会获得10到30积分的奖励! Thank you！

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