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【单选题】
公务电话维修属于A.
A2
B.
A3
C.
C1
D.
C2
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【简答题】正式场合着重的“TPO”原则是指:时间原则、 __________ 、___________。
【简答题】阶梯杆受力如图所示，设AB和BC段的横截面面积分别为2A和A，弹性模量为E，则截面C的位移为（）
【单选题】In Washington D. C. , 1600 Pennsylvania Avenue is a very special address. It is the address of the White House, the home of the President of the United States. Originally the White House was gray and ...
A.
because a French engineer was invited to design it
B.
because President George Washington liked to live in it
C.
because the British invaders lived in it in 1812—1814
D.
because it was to be the nation's capital city