下列不属于交通条件影响延误的是（）

A、下伏系统与滑动系统
B、润滑层
C、地面流水
D、滑面

A．The World War I had many European countries suspend convertibility of their currencies into golDB．The political costs of maintaining the overvalued pound were so great in the United Kingdom ．C．Nations facing 1929 – 1933 worldwide recession decided to pursue objectives such as higher employment rates and real growth rates, rather than to maintain the exchange value of their currencies．D．All of the above are the reasons that the gold standard finally collapseD．

A、Geological cycle
B、Long time cycle
C、Biological cycle
D、Opened cycle