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阅读语段,回答问题 PM2.5 (选段) (1)PM2.5是指大气中直径小于或等于2.5微米的颗粒物,也称为可入肺颗粒物。 PM2.5小,直径还不到人头发丝粗细的1/20, 并富含大量的有毒、有害物质,在大气中的停留时间长、输送距离远,因而对人体健康和大气环境质量的危害更大。 (2) PM2.5产生的主要来源是日常发电、工业生产、汽车尾气排放等过程中经过燃烧而排放的残留物,大多含有重金属等有毒物质。一般而言,2.5微米至10微米的粗颗粒物主要来自道路扬尘等;2.5微米以下的细颗粒物(PM2.5)则主要来自化石燃料的燃烧(如机动车尾气、燃煤)、挥发性有机物等。 说明对象是什么?
A.
颗粒物
B.
PM2.5
C.
日常发电
D.
残留物
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【单选题】What does Richard Campbell feel about his career?
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He likes his career though he's always short of money.
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He wishes he earned a high salary like his friends.
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He's happy and thinks he has enough to live on.
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【单选题】下列关于资产负债表填列的说法中错误的是()。
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【单选题】He abandoned a career that ______ to his becoming one of the most influential people in the world.
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【单选题】John's success in his career will be a great ______ to his aged parents.
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【多选题】资产负债表中“应收账款”项目的填列金额应根据()。
A.
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相关题目：
【单选题】What does Richard Campbell feel about his career?
A.
He likes his career though he's always short of money.
B.
He wishes he earned a high salary like his friends.
C.
He's happy and thinks he has enough to live on.
查看完整题目与答案
【单选题】高血压伴有阵发性室上性心动过速宜选用( )
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【单选题】John's success in his career will be a great ______ to his aged parents.
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【多选题】资产负债表中“应收账款”项目的填列金额应根据()。
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