He was very happy to hear from his old friend.英译汉
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The Olympic Games is an international sports event that takes place every four years.英译汉
Various substances differ widely in their magnetic characteristics.英译汉
A计权声级是模仿的哪个响度感受
A. 模拟人耳对50DBSPL以下强度噪声的响度感觉
B. 模拟人耳对55DBSPL以下强度噪声的响度感觉
C. 模拟人耳对60DBSPL以下强度噪声的响度感觉
D. 模拟人耳对55DBSPL以下纯音测听时的响度感觉
E. 模拟人耳对60DBSPL以下纯音测听时的响度感觉
Trees need water to grow.英译汉
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