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【单选题】
Psychological research indicates that college hockey and football players are more quickly moved to hostility and aggression than are college athletes in noncontact sports such as swimming. But the researchers conclusion—that contact sports encourage and teach participants to be hostile and aggressive—is untenable. The football and hockey players were probably more hostile and aggressive to start with than the simmers. Which of the following, if true, would most strengthen the conclusion drawn by the psychological researchers?A.
The football and hockey players became more hostile and aggressive during the season and remained so during the off-season, whereas there was no increase in aggressiveness among the swimmers.
B.
The football and hockey players, but not the swimmers were aware at the start of the experiment that they were being tested for aggressiveness.
C.
The same psychological research indicated that the football and hockey players had a great respect for cooperation and team play, whereas the swimmers were most concerned with excelling as individual competitors.
D.
The research studies were designed to include no college athletes who participated in both contact and noncontact sports.
E.
Throughout the United States, more incidents of fan violence occur at baseball games than occur at hockey or football games.
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【简答题】在萃取精馏中所选的取剂使 A1P值越(大 )越好 , 溶剂的选择性(增大 ) 。要提高萃取剂的选择性,可( 增大 )萃取剂的浓度。
【单选题】营业杠杆系数、财务杠杆系数和总杠杆系数之间的关系是（ ）。
A.
DTL=DOL+DFL
B.
DTL=DOL-DFL
C.
DTL=DOL×DFL
D.
DTL=DOL÷DFL
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