有符号的除法要耗费更多的时间，因为除法是使最终结果趋向于零的，而移位则是趋向于负无穷。
The signed division will take more time to execute because it rounds towards zero, while a shift rounds towards minus infinity.
大型储罐内的清砂一般采用停产后人工进罐清除法，工作强度大，环境恶劣，停产时间长，收效低。
Generally desanding of large tank adopts manual desanding that requires personnel to enter the tank after shutdown, with high work burden, severe environment, long shutdown time and low efficiency.
该方法既考虑信号误差，又考虑时间误差，避免除法、开方等复杂运算，精度高、速度快。
It takes both signal error and time error in consideration, avoids complicated operations such as division, square root, etc. So it has high precision and speed.
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