问题 解答题
某工厂为了扩大生产规模,计划购买5台A、B两种型号的设备,总资金不超过28万元,且要求新购买的设备的日总产量不低于24万件,两种型号设备的价格和日产量如下表.为了节约资金,问应选择何种购买方案?
 AB
价格(万元/台)65
日产量(万件/台)64
答案

设购买A型设备为x台,则购买B型设备为(5-x)台,

依题意得:(1分)

6x+5(5-x)≤28
6x+4(5-x)≥24
,(4分)

解得2≤x≤3.(6分)

∵x为整数,∴x=2或x=3.

当x=2时,购买设备的总资金为6×2+5×3=27(万元);

当x=3时,购买设备的总资金为6×3+5×2=28(万元).

∴应购买A型设备2台,B型设备3台.(8分)

阅读理解

阅读理解

     You know Australia is a big country, but you may not know how easy it is to get around. The

untouched beaches that go for miles and deserts that touch the horizon are just there, waiting to be

reached and explored. Following are the different ways you can explore our vast country.

     Getting around Australia

     Air

     Flying is the best way to cover large distances in a short time. You can spend more time on the

Australia's can't-miss landscapes and relaxing lifestyle. Moreover, competition among airlines makes

great flying fees available for you.

     Drive

    Australia has a vast network of well - maintained roads and some of the most beautiful touring routes

in the world. You have no difficulty finding car rental companies at major airports, central city locations,

suburbs and attractions.

     Bus

     Bus travel in Australia is comfortable, easy and economical. Buses generally have air conditioning,

reading lights, adjustable seats and videos. Services are frequent, affordable and efficient.

Rail

     Train travel is the cheapest and gives you an insight into Australia's size and variety, all from the

comfort of your carriage. Scheduled services are a great way to get quickly between our cities and

regional centers.

     Ferry(轮渡)

    The Spirit of Tasmania runs a passenger and vehicle ferry service between Melbourne and Tasmania

nightly. Extra services are running during summer rush hours. Sea - link ferries connect South Australia

and Kangaroo Island several times a day. Ferries connect suburbs in our capital cities

    Walk

    With easy - on - the - feel pedestrian streets, walking is a great way to get around our cities.

    Besides all of above, you can also experience some of the longest tracks and trails in the world in

central Australia - impressive journeys of a thousand kilometers or more that can take several weeks

to complete.

1. The underlined word "untouched" (in the 1st paragraph) means______.

A. ordinary        

B. dangerous        

C. natural        

D. boring

2. Which of the following is TRUE about traveling in Australia? ______.

A. More travelers make the flying fees among airlines higher than before

B. You can easily rent a car to explore its most beautiful touring routes

C. Taking a bus tour is the cheapest way

D. Train travel is uncomfortable

3. Ferry service between Melbourne and Tasmania usually runs ______.

A. only at night hours                    

B. only during rush hours

C. several times a day                    

D. between different cities

4. From the passage, we know that ______.

A. pedestrian walking is a great way to travel between cities

B. it takes much time to travel in Central Australia

C. you can also experience the impressive journeys of a thousand meters in central Australia

D. you have to walk over a thousand kilometers in Australia.

单项选择题