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2. Over 100 countries told the scientists their favorite colors and why they like them. 3. People have the appetite to eat food from a blue plate. 4. Green makes people calm and relaxed. 5. Yellow makes people happy. 答案 1. A 正确率: 71%, 易错项: B 2. B ...
搜索智能精选 题目两种声音的声强级相差20dB,它们的声强之比为[ C ] A. 2/1 B. 20/1 C. 100/1 D. 40/1 答案A.2/1