Results from this study indicate that direct verification of the Newton second law could be achieved satisfactorily within the permissible range of error.
结果表明，在实验误差允许的范围内牛顿第二定律均能得到较好地直接验证。
Through experimental verification, within the range of error permitting, theoretical value accords with experimental value, meanwhile error analysis is conducted.
通过实验验证，在误差允许的范围内，理论值和实验值是一致的，并对误差进行分析。
Measuring the speed, range and the actual speed of the ship, the range of error was mainly due to the spread of ultrasound in the water caused by the change in speed, the error is relatively small.
测量的航速、航程与船舶实际的航速、航程存在的误差，主要是由于超声波在水中的传播速度发生变化引起的，误差相对较小。
Measuring the speed, range and the actual speed of the ship, the range of error was mainly due to the spread of ultrasound in the water caused by the change in speed, the error is relatively small.
测量的航速、航程与船舶实际的航速、航程存在的误差，主要是由于超声波在水中的传播速度发生变化引起的，误差相对较小。
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