一、“单读数”法存在的问题在水平仪的使用中,人们常常习惯取用仪器水准上的两个长刻度线之一作为基准零线。当移动水平仪时,把气泡的任意一端的边线,距离相对应长刻线的格数,作为仪器的读数。这种仅用一个读数来计算示值的方法称为水平仪的“单读数”示值计算法。“单读数”示值计算法常常不能反映被测平面的真实水平状态。这是因为水平仪的水准本体(玻璃制成的弧形管)和其内部的液体(如乙醚)的膨胀系数相差极大,导致环境温度每变化2°～4°时,水准中的气泡 First, the problem of “single-reading” method In the use of level instrument, people often accustomed to take the instrument level as one of the two long-scale line as the baseline zero line. When moving the level, the bubble at either end of the line, the distance corresponding to the long line of the grid, as the instrument readings. This method of calculating the indication using only one reading is called the “single-reading” indication calculation of the level. The “single-reading” indication method often does not reflect the true horizontal state of the plane under test. This is because the level of the body (glass curved tube) and its internal liquid (such as ether) expansion coefficient vary greatly, resulting in each change in ambient temperature 2 ° ~ 4 °, the level of bubbles