【单选题】下列关于 RDD 之间窄依赖和宽依赖关系的描述,错误的是( )。
A.
窄依赖是指父 RDD 一个分区只被一个子 RDD 中一个分区所使用。
B.
宽依赖是指父 RDD 一个分区能被一个子 RDD 上多个分区所使用。
C.
窄依赖典型操作包括 map 、 filter 、 union 和 join 等。
D.
宽依赖典型操作包括 groupByKey 、 sortByKey 等。
【多选题】Which of the following statements about William Blake are true?
A.
William Blake is a both a poet and a painter. He showed great concern for political and social issues, and also cared for inner spiritual liberty.
B.
He published Songs of Innocence in 1789 which contains poems from children's point of view.
C.
The rhyme scheme of the poem London is abab cdcd efef ghgh.
D.
Included in Songs of Innocence, the poem London gives a fierce attack upon the evil society by depicting the city London's bareness and the miseries of the common people , which manifests William Blake's hightest achievement as a poet.
【单选题】下列关于弹性分布式数据集( RDD )的描述,错误的是( )。
A.
RDD 是指一个分布式对象集合,本质上是一个只读分区记录集合。
B.
每个 RDD 可分成多个分区,每个分区则是一个数据集片段。
【单选题】Ode to the West Wind was written by ______.
C.
Samuel Taylor Coleridge.
【单选题】In William Blake‘s poetry, the father(and any other in whom he saw the image of the father such as God, priest, and king)was usually a figure of _______ .
【简答题】A.Rubens. B.William Blake. C.Picasso. D.Vicent Van Gogh.