问题 解答题

汪师傅购进一批草莓,大草莓进价是每千克18元,有16千克,小草莓进价是每千克13元,有24千克。要是将两种草莓混合后,以每千克17元的价格销售能盈利吗?汪师傅的另一种想法是把草莓分开销售,每种在原价的基础上上调1元。你觉得哪种方案好?请你给汪师傅出个主意。

答案

先计算混合后的单位应是多少元,(18×16+13×24)÷(16+24)=15(元),

18×16+13×24=600(元),17×(16+24)=680(元),680-600=80(元),

(18+1)×16+(13+1)×24=640(元),640-600= 40(元),

还是混合后赢利多,能赚80元。

选择题
单项选择题

A weather map is an important tool for geographers. A succession of three of four maps presents a continuous picture of weather changes. Weather forecasts are able to determine the speed of air masses and fronts; to determine whether an individual pressure area is deepening or becoming shallow and whether a front is increasing or decreasing in intensity. They are also able to determine whether an air mass is retaining its original characteristics or taking on those of the surface over which it is moving. Thus, a most significant function of the map is to reveal a synoptic picture of conditions in the atmosphere at a given time.

All students of geography should be able to interpret a weather map accurately. Weather maps contain an enormous amount of information about weather conditions existing at the time of observation over a large geographical area. They reveal in a few minutes what otherwise would take hours to describe. The United States weather Bureau issues information about approaching storms, floods, frosts, droughts, and all climatic conditions in general. Twice a month it issues a 30-day "outlook" which is a rough guide to weather conditions likely to occur over broad areas of the United States. These 30-day outlooks are based upon an analysis of the upper air levels with often set the stage for the development of air masses, fronts, and storms.

Considerable effort is being exerted today to achieve more accurate weather predictions. With the use of electronic instruments and earth satellites, enormous gains have taken place recently in identifying and tracking storms over regions which have but few meteorological stations. Extensive experiments are also in progress for weather modification studies. But the limitations of weather modification have prevented meteorological results except in the seeding of super-cooled, upslope mountainous winds which have produced additional orographical precipitation on the windward side of mountain ranges. Nevertheless, they have provided a clearer understanding of the fundamentals of weather elements.

The thirty-day forecast is determined by examining()

A. upper air levels

B. satellite reports

C. changing fronts

D. daily air maps