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【多选题】
background-size是用来规定背景图像的尺寸，关于其属性值说法正确的有：A.
值为length时，若有两个值时，第一个值设置宽度，第二个值设置高度。一个值时，第二个值会被设置为 "auto"
B.
值为percentage时，是以父元素的百分比来设置背景图像的宽度和高度
C.
值为cover时，背景图完全覆盖背景区域
D.
值为contain时，图像的宽和高完全适应内容区域
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举一反三
【单选题】Which statement about the bubble sort is false?
A.
It is easy to program.
B.
It is a high-performance sort.
C.
It compares only adjacent elements with one another.
D.
The bubble sort compares successive pairs of elements.
【多选题】What does this level bubble suggest?
A.
On the surface where this bubble being set up, point B is higher than point A
B.
From point A to point B on the working stage of this bubble, along AB direction thiere is a descending slope.
C.
We don't know if the slope from point C to point D is a descending one or an ascending one.
【简答题】Names of companies involved in bubble therapy research.
【简答题】转录空泡(transcription bubble)
【单选题】如果要创建一个公式,可以____。
A.
执行“格式/字符”命令,在“字体”对话框中进行设置
B.
执行“插入/对象”命令,在“对象”对话框中选择Microsoft 公式3.0选项
C.
单击“表格和边框”工具栏上的“创建公式”按钮
D.
使用“绘图”工具栏上的“创建公式”按钮
【单选题】How is flow of goods controlled?( )
A.
By hardware．
B.
By software．
C.
By people
D.
By both hardware and software．
【简答题】Match the words 1-6to the definitions A-F to complete the sentences. 1 A carrier A buys the imported goods in lagre quantities. 2 A consumer B. Imports and exports goods. 3 A trader C trans...
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