题目:
工作效率一定,工作总量和工作时间______比例
工作时间一定,工作效率和工作总量______比例
工作总量一定,工作效率和工作时间______比例.
答案:
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Long long ago, there were many trees on the mountains. In order to build houses and grow crops, people cut down as many trees as they could. Soon all the trees...