ECMAScript6数组扩展的fill()函数,[1,2,3].fill(4)的结果是()。
A.[4]
B.[1,2,3,4]
C.[4,1,2,3]
D.[4,4,4]
A.[4]
B.[1,2,3,4]
C.[4,1,2,3]
D.[4,4,4]
第4题
A.NumPy 的ndarray是一种多维数组对象,可以由序列型对象生成。
B.pandas的DataFrame是一个表格型数据结构,含有一组无序的列,每列可以是不同值类型(数值、字符串、布尔值等等)。
C.pandas的Series可以看成是一个定长的有序字典。
D.dtype是一种特殊的对象,其含有将ndarray解释为特定数据类型所需的信息,int64表示有符号的64位整型。
第5题
填写下表中的空白部分。
Fill in the gaps in the table below.
第8题
A.He has to use a password.
B.He has to show his ID card.
C.He only needs to fill out a withdrawal form.
D.He needs to fill out a withdrawal form. and hand in the check book.
第9题
A.She has half finished filling out the form.
B.She doesn't remember to fill out the form.
C.She is glad that the man might help her.
D.She feels frustrated about filling out the form.
第11题
A.He has to use a password.
B.He has to show his ID card.
C.He only needs to fill out a withdrawal form.
D.He needs to fill out a withdrawal form. and hand in the chequebook.