根据图4回答29、30题。
如图4，某航空公司托运行李的费用与托运行李重量的关系为线型函数。
由图4可知行李的重量不超过______ Kg，就可免费托运。
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【B14】
A. competitiveness
B. comprehension
C. community
D. commitment
A．They reduce a person's appetite.B．They keep a person from being persistent in face o
A. They reduce a person's appetite.
B. They keep a person from being persistent in face of trouble.
C. They make a person's nerve system weak.
D. They make a person more vulnerable m disease.
A．Inform. students of the disadvantages of frying food.B．Find other students who will
A. Inform. students of the disadvantages of frying food.
B. Find other students who will work in the cafeteria.
C. Ask students to try a new dish he has made.
D. Collect students' opinions about meals.
指数平滑法也是加权平均法的一种。 ()
A. 正确
B. 错误
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