The influence of atmosphere on the groundwater levelsurveying quality is great.
气体对地下水位观测质量的影响是比较严重。
2
According to exchange rate reasonable balanced levelsurveying, the RMB revalues 2% to US dollar today, namely 1 US dollar exchanges 8.11 Yuan.
根据对汇率合理均衡水平的测算，人民币对美元即日升值2%，即1美元兑8.11元人民币。
3
At the national level it is easy enough, though expensive, to account for this by surveying CPOs and including them in the sample in proportion to their share of the population.