[填空题]
The Eiffel Tower (Fig. 13–29) is )mixwdch 6l (hu.5a 3( /*8igtk cdcbpbuilt ocu bc -qt-p1c9bjoh bz:8at;2 f wrought iron approximately 300 m tall. Estimate how much its height changes between July (average temperature of 25°C) and J -1ubc9 bbpcjtt h-8;zq: aoc2anuary (average temperature of 2 $^{\circ} $ C). Ignore the angles of the iron beams, and treat the tower as a vertical beam. m