问题
填空题
汞、橡胶、金刚石这些物质中，常温下呈液态的是______，适宜用做冲击钻钻头的是______．
答案
常温下，固态物质有橡胶、金刚石，液态物质有汞（水银）；
冲击钻的钻头要求使用硬度较大、熔点较高的材料制成，汞、橡胶、金刚石这些物质中，金刚石的硬度是最大的，熔点也很高，所以金刚石适宜做冲击钻的钻头．
故答案为：汞；金刚石．
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汞、橡胶、金刚石这些物质中，常温下呈液态的是______，适宜用做冲击钻钻头的是______．
常温下，固态物质有橡胶、金刚石，液态物质有汞（水银）；
冲击钻的钻头要求使用硬度较大、熔点较高的材料制成，汞、橡胶、金刚石这些物质中，金刚石的硬度是最大的，熔点也很高，所以金刚石适宜做冲击钻的钻头．
故答案为：汞；金刚石．
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2. Have you been to a _____ restaurant? I like going there. 3. We must brush our _____ after getting up every morning. 4. —Which would you like _____, an apple, a banana, or a pear? — A banana. 5. Li Lei is the _____ of all in our class. He exercises every morning. 6. My grandpa's _____ habits are pretty good, so he's very healthy. 7. Lucy often washes her _____ with hot water before she goes to bed. 8. —Have you _____ our teacher is ill? —No, not yet. 9. —How many times have you been to the Great Wall? —____ only. |