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A．They never occur.B．They are net affected by the force of gravity.C．In still air they would fall to earth.D．In moving air they fall at a speed of thirty-two miles per hour.
A．They never occur.
B．They are net affected by the force of gravity.
C．In still air they would fall to earth.
D．In moving air they fall at a speed of thirty-two miles per hour.
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