某医生调查得知10名女中学生体重X (kg)与肺活量Y(L)，经直线回归分析可知，b＝0.0748，若tb＞t0.05,8，按α＝0.05水准，可认为( )
A. 肺活量与体重大小无关
B. 肺活量随体重增加而增加
C. 体重与肺活量间无线性相关关系存在
D. 体重与肺活量间有函数关系存在
E. 体重与肺活量均值差别有统计学意义
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By the time you get there tomorrow, they ______ for Beijing.
A) will have left
B) are leaving
C) will leave
D) are to leave
The companies in the book including Motorola, 3M and ABB are examples that______.
A. take some measures to make employees creative
B. treat their workers as a part in a machine
C. give their workers more training and little everyday job
D. offer their workers more welfare and make little profit
The word "get-off" (Line 2, Para. 3) could be replaced by ______.
A. famous
B. primary
C. special
D. smart
电子商务交易流程中的最后一个环节是（）。
A. 信息流
B. 商流
C. 资金流
D. 物流
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