An analyst forecasts that spot interest rates will increase more than the increase implied by the current forward interest rates. Under these circumstances:（）

A. the analyst should establish a bearish bond portfolio.

B. all bond positions earn the same return.

C. the analyst should establish a bullish bond portfolio.

施工技术交底是某一单位工程开工前，或一个分项工程施工前进行的技术性交代，其目的是使施工人员对工程特点、技术质量要求、施工方法与措施和安全等方面有一个较详细的了解，以便于科学的组织施工，避免事故的发生。