题目详情
多选题 Instead of using a steam engine,as Langley had done,they decided to use a petrol engine,which was smaller and lighter and more efficient. The sentence tells us that_______________
A. Langley used a steam engine
B. Langley did not use a steam engine
C. They used a steam engine
D. A petrol engine was lighter than a steam engine

学科:默认课程
时间:2025-12-10 06:30:55
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