喷砂除锈时有哪些安全注意事项？
参考答案：
（1）施工人员在喷砂开始前，要穿好工作服，戴好手套，接好防护头罩内输送新鲜空气的管路，喷砂衣要密闭，使衣内砂尘在空气内不超过2mg/m3。
（2）不准带风修理喷砂设备或更换零件；
（3）喷砂时喷嘴不能对人，对车和对船；
（4）喷砂胶管应避免弯折过剧，要加强检查，防止个别部位管壁被磨损过薄发生炸裂。
阅读下列短文，根据短文内容完成表格中所缺信息，每空一词. “USA? Britain? Which country is better to study in?” We often hear such discussions. As China open its door, it is a dream for many Chinese students to study abroad. They want to learn about the outside world. It’s true that studying abroad can help students develop themselves. Their foreign language skills will be improved and it may be easier to find jobs. But there are problems that should be considered. Language is the first. Students must spend a lot of time learning another language. Students must also learn to live without parents’ care and deal with all kinds of things they haven’t to do before, like looking after themselves. There are reports about Chineses students abroad running into an ocean of difficulties and giving up finally. When they have to take care of themselves, it is hard for students to study well. Finally, studying abroad brings a heavy burden to the family. For most Chinese parents, the cost of studying abroad is very high. But is it worth it? We know that there are many famous people who have achieved success through their hard work in China. Liu Xiang is a good example. Once an American teacher invited him there, but he refused. He kept training hard with his Chinese teacher. He surprised the world when he won a gold medal at the Athens Olympic Games. So when you winder which country is better to study in, think it again.
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