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{{B}}Pushbike Peril{{/B}} Low speed bicycle crashes can badly injure —or even kill —children if they fall onto the ends of the handlebars so a team of engineers is redesigning the humble handlebar in a bid to make it safer. Kristy Arbogast, a bioengineer at the Children’s Hospital of Philadelphia in Pennsylvania, began the project with her colleagues after a study of serious abdominal 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 came 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 mechanism responsible for serious injures. They discov A. why the children and their parents were interviewed B. when the children tom the handlebars through 90 degrees C. what causes the children to topple over D. how serious injuries occur [判断题]Windows 98系统是一种应用软件。
A.正确 B.错误 [判断题]动火作业间断或终结后，应清理现场，方可离开。（）
A.正确 B.错误 [单项选择]
根据所学知识判断下列几种叙述中正确的是（） A. ②⑥ B. ②⑤ C. ③⑤ D. ①④ [单选题]一次起道量超过40mm应( )防护。
A.办理封锁施工手续,设置移动停车信号 B.办理慢行手续,设置移动减速信号 C.办理临时封锁施工手续,设置停车手信号 D.设置作业标 [单选题]对已备料未轧制的合同确实需要变更的(不含可以转为同标准同定尺的其它合同),需经销售副总和生产副总批准后才可以变更,并对销售员处以()合同的处罚(因延迟交货、产品质量原因撤销订单除外,由产品所协同销售公司研究处置意见)。
A.200元/个 B.100元/个 C.50元/个 D.10元/个 [多项选择]应收账款账户的期初余额为借方5000元，本期借方发生额10000元，本期贷方发生额8000元，则该账户的期末余额错误的为( )。
A. 借方7000元 B. 贷方7000元 C. 借方13000元 D. 贷方13000元 [单项选择]
18-三体综合征属于（） A. 单基因遗传病 B. 多基因遗传病 C. 染色体病 D. 线粒体病 E. 体细胞遗传病 我来回答: 提交
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