辐射事故分为特别重大辐射事故、重大辐射事故、较大辐射事故和一般辐射事故四个等级。
参考答案:对
“大错不犯,小错不断,气死公安,难倒法院。”
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1. 那时他正在努力算这道数学题。
He was trying hard to this math problem at that time.
2. 史密斯先生说话很慢以便学生们能够听清楚。
Mr. Smith speaks slowly the students can hear him clearly.
3. 今天天气很好,为什么不去散步?
It's fine today._ ____go out for a walk?
4. 你最好不要过分依赖父母,要学会照顾自己。
You'd better not too much your parents, and learn to look after yourself.
5. 对不起,刚才我错拿了你的伞。
Sorry, I took your umbrella just now.
6. 昨天你发生了什么事?
What you yesterday?
7. 乘电梯到二楼,向右拐。
the elevator the second floor and turn right.