问题 问答题 简答题

权威的美国《公路通行能力手册》(1950年)中,根据通行能力的性质和使用要求,将通行能力分为哪三种情况?

答案

参考答案:

1.基本通行能力:在理想的道路和交通条件下,在单位时间内能通过一条车道或道路上某一点的最大小客车数。

2.可能通行能力:在通常的道路和交通条件下,在单位时间内能通过一条车道或道路上某一点的最大车辆数。

3.实用通行能力:在通常的道路和交通条件下,行车密度不很高,不致引起过度的延误和阻碍驾驶的通行能力。

阅读理解

No one can change the weather. Nobody can control the weather. But if we read correctly the signs around us, we can tell what the more important changes in the weather will be. This way of telling what the weather will be like on the following day or two is called weather forecasting(天气预报).

For many centuries and in all countries, people have studied the weather and tried to make weather forecasting. Rings around the sun are a sign of coming rain. That many people feel their joints(关节) hurt is a sign of wet weather. Some birds fly high if fine weather is coming, but they fly near the ground if rainy or stormy weather is on the way. If you see a rainbow during rainy weather, this is a sign that the weather will become clear and fine. Such rainbows come in the evening. If the stars twinkle clearly at night, then fine weather will continue. If a fog appears in the morning just above a river, then the day will be warm. If the sunset is mostly red in colour, then the following day will be fine. If a rainbow appears in the morning, rainy weather will probably come.

Most of the above sayings have been made by the people who have used their eyes and brains to make weather forecasting.

小题1:Which of the following can be used here to replace(取代) the underlined phrase “on the way”?

A.away.

B.gone.

C.disappearing.

D.coming.小题2:When you see the stars twinkle clearly at night, the weather will be _______.

A.warm

B.rainy

C.clear and fine

D.cold小题3:Which of the following signs can tell the weather will probably be rainy?

A.A rainbow appears in the morning.

B.Some birds fly high.

C.The stars twinkle clearly at night.

D.Fogs appear in the morning just above a river.

单项选择题