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Pushbike Danger{{/B}} Low speed bicycle crashes can badly injure -- or even kill -- children if they fall onto the ends of the handlebars (车把). So a team of engineers is redesigning it to make it safer. Kristy Arbogast, a bioengineer at the Children’s Hospital of Philadelphia in Pennsylvania, began the project with her colleagues. The cases they reviewed about serious abdominal (腹部的) injuries in children in the past 30 years showed that more than a third were caused by bicycle accidents, "The task was to identify how the injuries occurred and come up with some countermeasures," she says. By interviewing the children and their parents, Arbogast and her team were able to reconstruct many of the accidents and identified a common A. they are not beautiful. B. they may kill children. C. they are likely to crash. D. they affect the speed of the bike. [单选题]下列属于影响汇率波动主要因素的有（ ）。
①国际收支②汇率政策
③市场预期及投机冲击④各国国内政治经济因素
A.①②③ B.①②④ C.①②③④ D.①② [单项选择]专利权不包括( )。
A. 发明专利权 B. 实用新型专利权 C. 外观设计专利权 D. 商品具体用途专利权 [单选题]LKJ-2000型监控记录装置查询当前揭示信息,显示机车前方( )米以内的揭示。
A.1000 B.2000 C.3000 [判断题]公司、企业、事业单位、机关、团体实施的危害社会的行为，法律规定为单位犯罪的，应当负刑事责任。
A.正确 B.错误 [填空题]
[单项选择]未动操作的情况下轴流式调压阀阀后压力升高并与上游压力持平的原因可能是（）。
A. 鼠笼上有赃物 B. 节流针阀被赃物堵塞 C. 用户减少用气量 D. A和C [单项选择]孕28周后超声发现胎盘附着在子宫内口周围，但没有遮盖宫颈口，称为（）
A. 完全性前置胎盘 B. 部分性前置胎盘 C. 低置胎盘 D. 胎盘早剥 E. 边缘性前置胎盘 我来回答: 提交
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