战略管理学家迈克尔·波特按照产品生产的价值形成和创造过程——价值链，把资源的开发和利

－How many _____ are there in the box？

－Oh, there’re four.

A．carrot

B．chicken

C．strawberries

D．egg

现代化油器种类很多，与简单化油器相比，增加哪些装置？

Woman: You’ve been doing weather reports for neatly 30 years. Has the weather got any worse in all these years
Man: Well, not necessarily worse. But we are seeing more swings.
Question: What does the man say about the weather()

A. It’s worse than 30 years ago.

B. It remains almost the same as before.

C. There are more extremes in the weather.

D. There has been a significant rise in temperature.

亨利常数值通过计算来确定。

“人民电信为人民”的根本宗旨是电信一切工作的出发点和（）。