问题
单项选择题
由政府主管部门和权威机构在物质毒性、燃烧、爆炸特性基础上，制定出危险物质及其( )。
A．危险源的辨识方法
B．临界量标准
C．危害程度标准
D．控制措施
答案
参考答案：B
解析：由政府主管部门和权威机构在物质毒性、燃烧、爆炸特性基础上，制定出危险物质及其临界量标准。
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由政府主管部门和权威机构在物质毒性、燃烧、爆炸特性基础上，制定出危险物质及其( )。
A．危险源的辨识方法
B．临界量标准
C．危害程度标准
D．控制措施
参考答案：B
解析：由政府主管部门和权威机构在物质毒性、燃烧、爆炸特性基础上，制定出危险物质及其临界量标准。
Mark was walking home from school one day when he noticed a boy ahead of him had dropped all of the books he was carrying. Mark helped t  he boy pick them up. 16 they were going the same way, he carried them for the boy. As they walked, Mark knew the boy’s name was Bill. Mark 17 discovered that he loved computer games, baseball and history and that he was having a lot of 18 with his other subjects.They arrived at Bill’s home first and Mark was invited in 19 Coke and to watch some television. The afternoon passed 20 with a few laughs and some shared small talk, and then Mark went home. They 21 to see each other around school, had lunch together once or twice and then 22 ended up from the same high school. Just three weeks before they finished school, Bill asked Mark if they could have a talk. Bill 23 him of the day years ago when they had first met. ‘Do you 24 wonder why I was carrying so many things home that day?’ asked Bill. ‘You see, I 25 out my locker because I didn’t want to leave a mess for anyone else. I had planned to 26 from home and I was going home to pack my things. But after we spent some time together 27 and laughing, I realized that 28 I had done that, I would have 29 a new friend and missed all the fun we would have together. So you see, Mark, when you picked up my books that day, you did a lot more. You 30 my life.’
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un away