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【单选题】
如图所示，管路等径，定态流动时，忽略机械能损失，系统各截面压强由低到高排序正确的是（）【图片】A.
3-3<4-4<1-1<2-2
B.
1-1<2-2<3-3<4-4
C.
4-4<3-3<2-2<1-1
D.
3-3<1-1<4-4<2-2
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【简答题】阅读理解。 Brodie's unusual story began in 1984 when she lost her right front leg in a hunting accident. Just two years old at the time, Brodie recovered quickly and had no trouble getting around on three ...
【多选题】汪某将郭某家小孩骗走，想带回自己家收养，后又害怕邻居发现，将该小孩弃之郊外人迹罕至的山上，结果小孩被发现时已冻死。汪某的行为构成下列哪些罪?
A.
拐卖妇女、儿童罪
B.
拐骗儿童罪
C.
故意杀人罪
D.
遗弃罪
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【简答题】某小孩2岁,经检查发现听力严重下降。询问家长后得知,在一岁时小孩曾经用过链霉素治疗感冒发烧。造成小孩听力下降的主要原因是
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