使用期限最长的石拱桥是（）
A、赵州桥
B、卢沟桥
C、高架引水桥
D、以上都不对
参考答案：A
－What made Susan so angry?
－____ in the rain for a long time.
Being kept waiting B. Being kept to wait
C. Because of waiting D. She was kept waiting
实施性成本计划是项目施工准备阶段的施工预算成本计划，它以项目实施方案为依据，采用企业的( )编制而成的。
A．施工定额 B．施工图定额 C．预算定额 D．概算定额
