参考答案:A, B, D, E
答案解析:本病发病与人种有关,与经济状况无关。
按驱动方式分类分为自动阀类、动力驱动阀类和手动阀类
Outline
1. The school activities announcements on the campus.
2. The first group takes part in these activities actively for various reasons.
3. The second group spend their time differently.
4. Your preference.
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