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第1题
第3题
直线回归分析中，按直线方程
，代入两点绘制回归直线，以下选项中正确的是
A、所有实测点都应在回归直线上
B、所绘回归直线必过点
C、所绘回归直线必过点
D、回归直线必过原点
E、x 的取值范围为 [-1,1]
F、实测值与估计值之差的平方和必小于零
第4题
A、了解领域当前研究状况。
B、精化研究目标和问题。
C、识别研究方法和技术。
D、凸显研究可能性。
第8题
Complete the text with the present simple form of the verbs in brackets. I (0) work (work)in the head office of a foreign currency exchange agency. The company (1) (have) offices all over the world,in airports and in city centres. My job (2) (be) a bit boring at times, especially the routine tasks. Onthe other hand, it's a responsible position- we all (3) (deal with)large sums of money every day. A lot of our work (4) (be)automatic: a machine (5) (count) the money, for example, I prefer that, because I (6) (not like)to make mistakes.We (7) (not often have) problems with false money:I think everybody (8) (know) that our machines (9) (be)very sophisticated.However, people occasionally (10) (try) to use false credit cards to buy foreign currency.
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