When was the name of Big Ben Tower changed into Elizabeth Tower ?
A. 2002
B. 2010
C. 2012
D. 2016
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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。
弯曲时最小弯曲半径越小则表示材料所允许的变形程度越大。( )
A. 对
B. 错