交通民俗的组成主要表现在三个方面：一（），二是（）；三是交通信仰习俗。 A.画 B.

下图为世界海陆分布图。读图回答1～3题。

1．图中河流①水位最低点一般出现在[ ]

A．春季

B．夏季

C．秋季

D．冬季

2．图中山脉②地处安第斯山脉的南段，位于[ ]

A．亚欧板块与太平洋板块之间

B．太平洋板块与美洲板块之间

C．南极洲板块与美洲板块之间

D．南极洲板块与太平洋板块之间

3．图中海洋③的名称是[ ]

A．黑海

B．里海

C．地中海

D．红海

压力容器在正常使用压力范围内，无塑性变形的情况下，突然发生的爆炸称为（）

A.塑性破裂

B.脆性破裂

C.疲劳破裂

D.蠕变破裂

(B)

You can tell the age of a tree by counting its ring. But these records of a tree’s life really say a lot more. Scientists are using tree ring to learn what’s been happening on the sun’s surface for the last ten thousand years. Each ring represents a year of growth. As the tree grows, it adds a layer to its trunk, taking up chemical elements from the air. By looking at elements in the rings from a certain years, scientists can tell what elements were in the air that year. Dr. Stevenson is analyzing one element, carbon-14, in ring from both living and dead tree. Some ring go back almost ten thousand year to the end of the Ice Age. When Stevenson followed the carbon-14 levels changed with the intensity of solar burning. You see, the sun has cycles. Sometimes it bums fiercely, and at other times it is relatively calm. During the sun’s violent periods, it throw off charged particles in fast moving streams called "solar winds". The particularly interfere with the formation of carbon-14 on earth. When there is more solar wind activity, less carbon-14 is produced. Ten thousand years of tree ring show that the carbon-14 level rises and falls about every 420 years. The scientists concluded that solar wind activity must follow the same cycle.

What affects the amount of carbon-14 on earth（）

A. The lifecycle of trees.

B. The number of trees.

C. The intensity of solar burning.

D. The quality of air.

项目团队应当具有统计知识，以完成质量控制活动，最重要的是(),()

直径很细，长度比直径大很多倍的细长物质称之为纺织纤维。