题目内容

以下哪些是IPv6的优势？（）

A. 地址空间巨大
B. 层次化的路由设计
C. 效率高，扩展灵活
D. 支持即插即用
E. 更好的安全性保障
F. 引入了流标签的概念

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Task 3If you want to get around Vancouver easily, then you will want to take the SkyTrain aroundthe city. Launched in 1986,SkyTrain is the oldest and one of the longest fully-automated,driverless, rapid transit systems in the world. It runs on a guide way, high above city streets,though there are a few stations located underground. The Blue and Red Lines connect downtownVancouver with the cities of Burnaby and Surrey. The Green Line connects downtown Vancouverto the Vancouver International Airport and the city of Richmond.You can buy a day pass which can take you around the city as well as provide you with sidetrips to the North Shore with the ferry (轮渡）。 You can also ride Vancouver's metro bus systemand travel around downtown, and many other beautiful areas.If you are visiting Vancouver, the SkyTrain is your best bet at seeing every corner of the city.You can buy SkyTrain day passes at most grocery stores like Safeway and Save on Foods. You canalso purchase passes at the SkyTrain station and the Ferry terminal.

石油沥青的标号按( )划分。

A. 油分含量
B. 蒸发损失
C. 闪点
D. 黏度或针入度

石油沥青油毡的标号是按( )划分的。

A. 抗拉强度
B. 油毡质量
C. 防水性
D. 原纸1 m2的质量

由于木材纤维状结构及年轮的影响,木材的力学性质与木材纹理方向有很大关系。以下4种情况中,( )受力是最不利的。

A. 顺纹抗拉
B. 顺纹抗压
C. 横纹抗拉
D. 横纹抗压