Venezuela's opposition says party leader kidnapped hours after being freed
Subina Shrestha,BBC Eye Investigationsand
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Torque is the measure of a twisting or rotating force that can move something, like a wheel, around an axis.
（七）射线装置，是指在接通电源后方能产生电离辐射的装置，如X射线机、加速器、中子发生器等。