When was the name of Big Ben Tower changed into Elizabeth Tower ?
A. 2002
B. 2010
C. 2012
D. 2016
Which was the function of Tower of London ?
A. palace
B. powder storage
C. mint plant
D. all of the above
弯曲件的变形特点是:内层金属,外层金属,变形区料厚,而弯曲中性层;当弯曲线较长时,弯曲线是的,横截面是畸形的。