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问答题

Choose a summary word from the list to complete the sentence. 
process;     situation;     finding;     estimation;     problem;     difficulty;     disruption;     view
Until adjustment of the body clock has occurred, individuals suffering from “jet lag” feel tired during the new daytime, yet are unable to sleep properly during the new night. For athletes in particular this ________  of sleep can affect mood and powers of concentration and might result in poorer training performances and competition results (Reilly et al. 1997b).

多项选择题

金属结构构件运输类型按构件的类型和外形尺寸划分为三类，属于二类构件的有（  ）。
A、钢柱
B、钢梁
C、支撑
D、钢楼梯
E、轻钢屋架