问题
名词解释
声能强度
答案
参考答案：
在考查点上以特定方向，通常与该方向垂直的单位面积传递的声能平均速率。
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声能强度
参考答案：
在考查点上以特定方向，通常与该方向垂直的单位面积传递的声能平均速率。
| 选择适当的词组填空。根据所提供的语景，从方框中选择正确的短语填空完成句子： | |
2. The pilot, whether _____or design, made the plane do a sharp turn. 3. The library was built ______ the scientist. 4. As they don't have enough gas, they have decided to ______gas supplies to other cities. 5. The good news _________ whoever heard it. 6. -I wonder if I could use your dictionary. -Sure, _____. 7. He _________ making everybody around him happy. 8. On Halloween, children would _____ and go door to door asking for treats or playing tricks. |