题目内容
机械危险的伤害实质，是机械能（动能和势能）的（）、流动或转化，导致对人员的接触性伤害。
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机械危险是指由于机器零件、工具、工件或飞溅的固体、流体物质的机械作用可能产生伤害的各种物理因素的总称。
无论是机器预定功能的设计还是安全防护的设计，都应该遵循以下两个基本途径：一是选用适当的设计结构，尽可能避免危险或减小风险；二是通过减少对操作者涉入危险区的需要，限制人们面临危险。
机器设备的本质安全，是指利用技术手段进行机器预定功能的设计和制造，不需要采用其他安全防护措施，就可以在预定条件下执行机器的预定功能时能够满足机器自身安全的要求。
I was thinking about my 1.______ list—you know, a list of things you want to do before you die? Anyway, one thing on mine is I plan to visit Antarctica someday. It’s the 2._______ place on Earth. Everyone always says to me, “what can you do in Antarctica?” A lot, actually. You can see penguins and other animals. There are mountains, so you can alsogo skiingor hiking.I learned about 3._______ Egypt in school, and I’d love to visitthe Valley of the Kingsin Luxor. It’s called “the world’s largest outdoor museum”. Today, I saw a video of a hot air balloon flying over the Valley of the Kings. It was so cool! The video also showed a person4.______ ridingalongthe Nile River. I want to do that someday.My dream is togo mountain bikingin theFrench Alpssomeday. The area is famous for its beautiful mountain 5._______, and I hear thebike trailsare great, especially in the summer. In winter, it’s also a great place to go 6._______.The Serengetiis 7._______ on my bucket list. Imagine seeing millions of wild animals of different kinds—lions, elephants, monkeys—in their natural environment. You can 8._______ in the park at night and during the day, you can see the animals up close. I hope I can do this someday.[音频]
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