他苦思了很长时间并且仍然无法找出方法来测定黄金的重量和密度。
He had struggled for a long period and still couldn't figure out the method to do that.
先测定整个装材卡车的重量。
结果表明，采用“重量反应法”测定消防车质心位置是一种可行的有效方法。
It is concluded that the weight feedback method is a feasible and effective way to measure the barycenter of a fire vehicle.
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