The factors of influences precision of observation data are mainly instrument failure, water level, atmospheric pressure and air temperature.
影响观测资料精度的主要因素是仪器故障、水位、气压、气温等；
Method:Take water as dissolvent, make the culture medium, put it into constant temperature oven, nourish and observation.
以其更有利于生产。方法：以水为溶剂，将培养基制成后，置于恒温箱中，培养，观察。
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