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【多选题】
以下哪当代儿科学面临的机遇和挑战（）A.
感染性疾病的新传播和抗生素对策
B.
儿童精神卫生
C.
以遗传代谢病为首的儿科疾病基因诊断治疗
D.
成人疾病的儿童期预防
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A.
int addValue（ int a， int b ）{// do something...}
B.
public void addValue （）{// do something...}
C.
public int addValue（ int a ）{// do something...}
D.
public int addValue（ int a， int b ）throws MyException {//do something...}
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