问题
填空题
在机械传动中，理论上能保证瞬时传动比为常数的是（），能缓冲减振、并起到过载安全保护作用的是（）
答案
参考答案：齿轮传动；带传动
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在机械传动中，理论上能保证瞬时传动比为常数的是（），能缓冲减振、并起到过载安全保护作用的是（）
参考答案：齿轮传动；带传动
I heard the bees long before I saw them. It was a very hot afternoon, and we decided to 21 in the river near my home. As we climbed down a small rocky hill toward the water, my boyfriend John 22 started to shout and then jumped into the water below. Peter and Mary quickly 23 but I was too far away to jump. I was 24 . I heard a low hum, which was growing louder. From a 25 , the group of bees looked almost like a cloud of smoke. As it got closer, I realized it was actually thousands of bees flying towards me. All I could do was 26 my face with my hands. 27 , I thought that if I sat very 28 , the bees would think I was just another rock. After a few seconds, I knew my 29 had failed. The bees were attacking me. I could hear my friends shouting at me to get down. But it wasn’t so easy. The only way I could 30 was to use my hands to climb down the rocks. However, I was afraid to do that at first because my face would be 31 . The noise the bees made was so loud and 32 , and I had no choice. I rushed down the rocks and jumped into the pool. I was just so happy to be free from the pain and the water felt so 33 . But we still weren’t out of 34 . Every time we tried to climb out, the bees flew back over our heads. We spent the next three hours in the water until the bees finally lost 35 .
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