Under different pressures the flashing in riser of natural circulation system and its effect on flow stability were studied by the method of visual observation in synchronism with data recording.
采用可视化观察与数据同步记录分析相结合的方法，研究了不同压力条件下自然循环系统上升段中的闪蒸现象及其对自然循环稳定性的作用。
Up to now, the visual observation is still the main method in recording meteors although several other techniques have been developed.
迄今为止，在流星的多种观测手段中，目视观测仍居主导地位。
Based on many years of study, such methods as visual observation, interior extrapolation method and GPS positioning method used by look-outs for reporting fire are summarized.
通过多年的研究，总结了瞭望员安全报火的方法，即目测法、交叉法、航点法。
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