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【单选题】

Pushbike er

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 cause for serious injuries. They discovered that most cases occur when children hit an obstacle at slow speed, causing them to topple (摇摆) over. To maintain their balance the children turn the handlebars through 90 degrees—but their momentum (冲力) forces them into the end of the handlebars. The bike then falls over and the other end of the handlebars hits the ground, pushing it into their abdomen (腹部).
The solution the group came up with is a handgrip (握柄) fitted with a spring and damping (减速) system. The spring absorbs up to 50 per cent of the forces transmitted (传递) through the handlebars in an impact. The group hopes to commercialize the device, which should add only a few dollars to the cost of a bike. "But our task has been one of education because up until now, bicycle manufacturers were unaware of the problem. " says Arbogast.
Pushbike erHow many abdominal injuries in children were caused by bicycle accidents

A.
Thirty.
B.
Ninety.
C.
50 percent.
D.
More than a third.
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【单选题】第二篇 Pushbike Peril 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 the humble h...

A.
it is not easy to persuade manufacturers to adopt the new design.
B.
the team of engineers has not found any countermeasures.
C.
children like to ride bicycles at a very low speed.
D.
a lot of children were killed in bicycle accidents in the past 30 years.

【单选题】(2005年)要用冲床在厚度为t的钢板上冲出一圆孔,则冲力大小( )。

A.
与圆孔直径的平方成正比
B.
与圆孔直径的平方根成正比
C.
与圆孔直径成正比
D.
与圆孔直径的三次方成正比

【单选题】胎心率早期减速的原因

A.
胎儿缺氧
B.
胎动
C.
子宫收缩
D.
胎头受压
E.
胎盘功能溅低

【单选题】不属于船舶摇摆造成的不良后果的是()。

A.
剧烈的横摇使船身横倾过大,可能导致倾覆
B.
乘员居住条件变坏,影响船员工作,引起旅客晕船呕吐
C.
影响主机的正常工作,减少主机的使用寿命
D.
甲板浸水、影响甲板机械设备的正常运转和船员的工作

【单选题】在不规则波中顶浪前进说明船舶摇摆性可__。

A.
用谐摇的概念
B.
用临界状态的概念
C.
用不规则波的概念
D.
用摇摆周期的概念
相关题目:
【单选题】第二篇 Pushbike Peril 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 the humble h...
A.
it is not easy to persuade manufacturers to adopt the new design.
B.
the team of engineers has not found any countermeasures.
C.
children like to ride bicycles at a very low speed.
D.
a lot of children were killed in bicycle accidents in the past 30 years.
【单选题】(2005年)要用冲床在厚度为t的钢板上冲出一圆孔,则冲力大小( )。
A.
与圆孔直径的平方成正比
B.
与圆孔直径的平方根成正比
C.
与圆孔直径成正比
D.
与圆孔直径的三次方成正比
【单选题】胎心率早期减速的原因
A.
胎儿缺氧
B.
胎动
C.
子宫收缩
D.
胎头受压
E.
胎盘功能溅低
【单选题】单板滑降中的减速是通过什么控制的?()
A.
前后刃的纵滑
B.
前后刃的后滑
C.
前后刃的横滑
【单选题】不属于船舶摇摆造成的不良后果的是()。
A.
剧烈的横摇使船身横倾过大,可能导致倾覆
B.
乘员居住条件变坏,影响船员工作,引起旅客晕船呕吐
C.
影响主机的正常工作,减少主机的使用寿命
D.
甲板浸水、影响甲板机械设备的正常运转和船员的工作
【单选题】在不规则波中顶浪前进说明船舶摇摆性可__。
A.
用谐摇的概念
B.
用临界状态的概念
C.
用不规则波的概念
D.
用摇摆周期的概念
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