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【单选题】
Table 3-5 Assume that England and Spain can switch between producing cheese and producing bread at a constant rate. Labor Hours Needed to Make 1 Unit of Number of Units Produced in 40 Hours Cheese Bread Cheese Bread England 1 4 40 10 Spain 4 8 10 5 Refer to Table 3-5 . Which of the following combinations of cheese and bread could England not produce in 40 hours?A.
5 units of cheese and 9 units of bread.
B.
10 units of cheese and 7.5 units of bread.
C.
20 units of cheese and 5 units of bread.
D.
30 units of cheese and 2.5 units of bread.
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【简答题】网络信息资源检索的特点：信息检索空间的拓宽、交互式作业方式、用户界面友好且操作方便。( )
【单选题】下面关于include指令和标签的区别描述，错误的是
A.
标签实现动态包含，而include指令实现静态包含
B.
标签运行时起作用，而include指令编译时起作用
C.
标签被包含页面可以改变响应头，而include指令不改变响应头
D.
标签被包含页面不可以改变响应头，而include指令可以改变响应头