CR 新桥旧桥 大家帮忙看看

Mayanist

P22 新桥旧桥

2007补充一道CR，源于2006年9月，看来去年的JJ也有借鉴作用。
关于新桥旧桥的选了一个说是因为新吊桥跟旧吊桥在吊起来之前都要一小时的通知时间(感谢Ruisseau9.5)
The city currently has a bridge which has to raise and open to let the boat pass through. And, the city is planning to construct a new bridge which is higher than the current. Since the new bridge will not open and raise as often as before, it will reduce the traffic time. Weaken this proposal

 

my answer is that "some boats are too wide to the poles of current bridge".

my logic reasoning is that the proposal only raises the bridge height but not make it wide. The new bridge will have the same problem as current one. (感谢apistitan9.25北美加州)

 

-- 我的问题是：难道谈width不是无关吗？能说新桥的location有问题吗？

hang13

这题跟本月JJ有关吗？MAYA?

我也觉得WIDE是无关，因为老桥也只提到了要经常升高的。

老桥肯定没WIDE问题吧，升高也不会解决WIDE问题吧。

而且对于新桥明确说“Since the new bridge will not open and raise as often as before,”

所以是否还有别的削弱，应该是除了高度外还有他因。

“新吊桥跟旧吊桥在吊起来之前都要一小时的通知时间”要好一些。

Mayanist

我没有复习逻辑，全靠前两天根据机警联想一点，随便挖了一个过去的机井看到了这个题，你看是否可以借用一个GWD题的思路：

P39 行车时间

Gwd-28-Q11

Trancorp currently transports all its goods to Burland Island by truck. The only bridge over the channel separating Burland from the mainland is congested, and trucks typically spend hours in traffic. Trains can reach the channel more quickly than trucks, and freight cars can be transported to Burland by barges that typically cross the channel in an hour. Therefore, to reduce shipping time, Trancorp plans to switch to trains and barges to transport goods to Burland.

 

Which of the following would be most important to know in determining whether Trancorp’s plan, if implemented, is likely to achieve its goal?

A: Whether transportation by train and barge would be substantially less expensive than transportation by truck.
B: Whether there are boats that can make the trip between the mainland and Burland faster than barges can
C: Whether loading the freight cars onto barges is very time consuming.
D: Whether the average number of vehicles traveling over the bridge into Burland has been relatively constant in recent years?
E: Whether most trucks transporting goods into Burland return to the mainland empty?

OA: C 

我对这个题的想法是：总时间=路上时间+上路时间

上面桥的问题是否也可以类似考虑？

hang13

这个题跟那个有点不一样，

一个是 老桥与新桥比，区别明确了新桥比老桥高，不用老升起

一个是 过桥与摆渡比，没说别的

 

 反正削弱就是要找他因呗，如果非说新修的桥非常2，就是宽度不够也没办法。。

如果不是JJ那就不纠结啦，爱谁谁，哈哈

Mayanist

以下是引用hang13在2009-3-19 1:02:00的发言：

这题跟本月JJ有关吗？MAYA?

我也觉得WIDE是无关，因为老桥也只提到了要经常升高的。

老桥肯定没WIDE问题吧，升高也不会解决WIDE问题吧。

而且对于新桥明确说“Since the new bridge will not open and raise as often as before,”

所以是否还有别的削弱，应该是除了高度外还有他因。

“新吊桥跟旧吊桥在吊起来之前都要一小时的通知时间”要好一些。

同意，谢谢！肯定有其他原因：detour，更多的车都到新桥等应该是可能的他因吧，还能想到其他的吗？

hang13

不过你说的上桥有道理

新桥高了，同样的距离坡度就大了，从安全角度考虑，车速会降低

我有同学画桥梁的，如果角度太大，空间有不足以拉长引桥，原本限速80的 就变成限速30了

GMAC会不会出这么精妙的选项呢？

[此贴子已经被作者于2009-3-19 1:23:01编辑过]

Mayanist

以下是引用hang13在2009-3-19 1:19:00的发言：

不过你说的上桥有道理

新桥高了，同样的距离坡度就大了，从安全角度考虑，车速会降低

我有同学画桥梁的，如果角度太大，空间有不足以拉长引桥，原本限速80的 就变成限速30了

GMAC会不会出这么精妙的选项呢？

专业：

1）坡度大，速度小

2）引桥长，绕路远

hang13

我靠 绕路远你都想到了

这个修桥的人真可怜，被折腾死了