对高压试验填写第一种工作票有哪些具体规定？

A、B、C、D是初中阶段常见的物质，其中A是一种无色液体，它们之间的相互转化如下图所示。试判断：

（1）写出A在空气中燃烧的化学方程式；

（2）B、D两种物质可以相互转化，请分别写出一种转化的方法：

A tree’s age can be determined by counting the annual growth rings in its trunk. Each ring represents one year, and the ring’s thickness reveals the relative amount of rainfall that year. Archaeologists successfully used annual rings to determine the relative ages of ancient tombs at Pazyryk. Each tomb was constructed from freshly cut logs, and the tombs’ builders were constrained by tradition to use only logs from trees growing in the sacred Pazyryk Valley.
Which one of the following, if true, contributes most to an explanation of the archaeologists’ success in using annual rings to establish the relative ages of the tombs at the Pazyryk site ？（）

A．The Pazyryk tombs were all robbed during ancient times, but breakage of the tombs’ seals allowed the seepage of water, which soon froze permanently, thereby preserving the tombs’ remaining artifacts.

B．The Pazyryk Valley, surrounded by extremely high mountains, has a distinctive yearly pattern of rainfall, and so trees growing in the Pazyryk Valley have annual rings that are quite distinct from trees growing in nearby valleys.

C．Each log in the Pazyryk tombs has among its rings a distinctive sequence of twelve annual rings representing six drought years followed by three rainy years and three more drought years.

D．The archaeologists determined that the youngest tree used in any of the tombs was 90 years old and that the oldest tree was 450 years old.

E．All of the Pazyryk tombs contained cultural artifacts that can be dated to roughly 2300 years ago.

新闻评论的深化作用包括（）

A.深化新闻报道的主题

B.对政治问题发表意见

C.从思想、政治、理论高度分析问题

D.善于抓重要的选题

E.帮助读者掌握科学分析的方法

货运站经营者应当按照货物的性质、保管要求进行（）。

A、分隔存放

B、分类存放

C、离开存放

D、异室存放

饮酒后只要血液中酒精含量达不到20mg/ml时就可以驾驶车辆。