承受动力荷载的构件最适于采用（）。
A.角焊缝
B.围焊
C.对接焊缝
D.两面侧焊
参考答案：C
—Tom seems to be familiar with London.
---Yes. He ___________ here for three years. It’s great for him to be back.
A．have lived
B．had lived
C．lived
D．lives
礼仪的原则有哪十条？
