某家店准备打折出售一批滞销的电脑，经核算，如果按正价打九折销售，每台还可盈利305元，如果打八折，就要亏损175元。那么这种电脑的进货价是（）元。
A.4800
B.4625
C.4015
D.3940
第1题
A．title
B．style
C．italic
D．science
第2题
A．title
B．style
C．italic
D．science
第3题
A．title
B．style
C．italic
D．science
第4题
A．title
B．style
C．italic
D．science
第5题
A．title
B．style
C．italic
D．science
第6题
A．title
B．style
C．italic
D．science
第7题
from scrapy.selector import Selector htmlText=''' <html> <body> <bookstore> <title>books</title> <book> <title>Novel</title> <title lang="eng">Harry Potter</title> <price>29.99</price> </book> <book> <title>TextBook</title> <title lang="eng">Learning XML</title> <price>39.95</price> </book> ''' selector=Selector(text=htmlText) _____________________________________ for e in s: print(e) 程序结果： <selector xpath="//book/title" data="<title>Novel</title>"> <selector xpath="//book/title" data="<title lang=" eng">Harry Potter</selector></selector></bookstore></body></html></title>"> <selector xpath="//book/title" data="<title>TextBook</title>"> <selector xpath="//book/title" data="<title lang=" eng">Learning XML</selector></selector></book></bookstore></body></html></title>">
A、s=selector.xpath("/book").xpath("./title")
B、s=selector.xpath("//book").xpath("./title")
C、s=selector.xpath("//book").xpath("/title")
D、s=selector.xpath("/book").xpath("/title")
第8题
A．title
B．style
C．italic
D．science
第9题
A．title
B．style
C．italic
D．science
第10题
from scrapy.selector import Selector htmlText=''' <bookstore> <book> <title lang="eng">Harry Potter</title> <price> 29.99 </price> </book> <book> <title lang="eng">Learning XML</title> <price> 39.95 </price> </book> </bookstore> ''' selector=Selector(text=htmlText) print(type(selector)); print(selector) _______________ print(type(s)) print(s) 查找所有的 <title>
A、s=selector.xpath("title")
B、s=selector.xpath("//title")
C、s=selector.xpath("/title")
D、s=selector.xpath("///title")
参考答案：<span style="color:rgb(255, 0, 0)">B</span>
4、from scrapy.selector import Selector htmlText=''' <html> <body> <bookstore> <title>books</title> <book> <title>Novel</title> <title lang="eng">Harry Potter</title> <price> 29.99 </price> </book> <book> <title>TextBook</title> <title lang="eng">Learning XML</title> <price> 39.95 </price> </book> ''' selector=Selector(text=htmlText) _____________________________________ for e in s: print(e) 程序结果： <selector xpath="//book/title" data="<title>Novel</title>"> <selector xpath="//book/title" data="<title lang=" eng">Harry Potter"> <selector xpath="//book/title" data="<title>TextBook</title>"> <selector xpath="//book/title" data="<title lang=" eng">Learning XML">
A、s=selector.xpath("/book").xpath("./title")
B、s=selector.xpath("//book").xpath("./title")
C、s=selector.xpath("//book").xpath("/title")
D、s=selector.xpath("/book").xpath("/title")
