某三铰拱的轴线为合理拱轴，在外荷载下拱截面内力为零的是（）
A.弯矩
B.剪力
C.轴力
D.拉力
E.压力
参考答案：A, B, D
办理工程竣工验收备案应当提交的材料不包括( )。
A．工程竣工验收备案表
B．工程竣工验收报告
C．工程竣工具体期限表
D．施工单位签置的工程质量保修书
Tom _____ his father and his father _____ very young. [ ]
A. looks like; looks like
B. looks like; looks
C. looks; looks like
D. looks; looks
