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iftheyareburned,theygivepoisonousgases中间填什么?

题目详情
if they are burned,they give _poisonous gases中间填什么?
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答案和解析
give off  放出,释放 ,散发出give off,send forth,or discharge; as of light,heat,or radiation,vapor,etc.; give out与give off 都是释放、散发的意思,也可以填 off 或out如果受到燃烧,他们就会释放出有毒气体....