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听力原文： Before the 20th century, the horse provided day to day transportation in the United States. Trains were used only for long-distance transportation. Today the car is the most popular sort of transportation in all of the United States. It has completely replaced the horse as a means of everyday transportation. Americans use their car for nearly 90 percent of all personal trips. Most Americans are able to buy cars. The average price of a recently made car was $ 2050 in 1950, $ 2740 in 1960 and up to $ 4750 in 1975. During this period American car manufacturers set about improving their products and work efficiency. As a result, the yearly income of the average family increased from 1950 to 1975 faster than the price of cars. For this reason purchasing a new car takes a smaller part of a family's total earnings today. What was the only use of trains before the 20th century?A.
The use for short-distance transportation.
B.
The use for day to day transportation.
C.
The use for long-distance transportation.
D.
The use for transportation of precious things.
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【简答题】人脸识别的实现包括 和 两方面
【单选题】悬臂梁受力如图所示，其中【图片】
A.
AB 段是纯弯曲， BC 段是橫力弯曲
B.
AB 段是橫力弯曲， BC 段是纯弯曲
C.
全梁均为橫力弯曲
D.
全梁均为纯弯曲
【单选题】悬臂梁受力如图所示,其中( )
A.
AB 段是纯弯曲 ，BC 段是剪切弯曲;
B.
AB 段是剪切弯曲，BC 段是纯弯曲;
C.
全梁均是纯弯曲
D.
全梁均为剪切弯曲
【单选题】悬臂梁受力如图所示，其中 。【图片】
A.
AB 段是纯弯曲， BC 段是横力弯曲；
B.
AB 段是横力弯曲， BC 段是纯弯曲；
C.
全梁均是纯弯曲；
D.
全梁均是横力弯曲。
【单选题】悬臂梁受力如图所示,其中 。
A.
全梁都是橫力弯曲
B.
AB 段发生橫力弯曲， BC 段发生纯弯曲
C.
AB 段发生纯弯曲， BC 段发生橫力弯曲
D.
全梁都是纯弯曲
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