题目内容
There is no known single cause of autism, as genetic components, environmental factors or even vaccine may cause autism.
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The earlier a child receives early intervention services, the better the child’s prognosis.
On the 2nd of April every year, it’s an internationally recognized day, which is World Autism Awareness Day.
For us, we should try to learn more knowledge about the symptom of autistic people and care them with professional knowledge and patience.
截面面积相同，工字型截面比矩形截面抗弯能力好
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