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【单选题】
对以下代码有关命名空间说法错误的是()。A.
命名空间可以避免元素命名冲突
B.
命名空间声明使用关键字xmlns，是XML namespace的缩写，关键字的字符串固定
C.
命名空间可以有两种方式声明，一种是明确声明，一种是默认声明
D.
声明命名空间时，可以指明命名空间的前缀名称，名称可以任意起
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【单选题】Rudolph had to wear an iron leg brace at a very young age because _____.
A.
she dreamed of becoming the fastest woman in the world
B.
that was how she was trained to walk and run like other kids
C.
her left leg was crippled(致残的) due to several childhood illnesses
D.
her mother told her that with the leg brace she could do whatever she wanted to do
【简答题】分度圆上的模数和压力角相等,且为____________,齿厚和齿槽宽____________的齿轮,称为标准齿轮。
【简答题】Rudolph had to wear an iron leg brace
at a very young age because _____.A. she dreamed of becoming the fastest woman in the world B. that was how she was trained to walk and run like other kids C. her...
【简答题】分度圆上的压力角等于（），摸数取的是标准值，齿厚和齿槽宽相等的齿轮，称为标准齿轮。
【单选题】国外三家马车具体是指()
A.
Coursera 、 MOOC 、 Edx
B.
SOOC、 Coursera 、 Edx
C.
Coursera、 Udacity 、 Edx
D.
Coursera、 Spoc 、 Udacity
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