以下关于背景描述正确的是 ( ) A: ackground B: ackground-attachment C: ackground-repeat D: ackground-image

下列代码如何简写： background-image: url(tp.jpg); background-position:centertop; background-repeat:no-repeat; A: ackground: url(tp.jpg) no-repeat centertop; B: ackground: no-repeat centertop url(tp.jpg); C: ackground: url(tp.jpg) centertopno-repeat;

下列样式代码中，可用于设置背景图像平铺方式的是（ ） A: ackground-repeat:no-repeat; B: ackground-attachment:fixed; C: ackground-attachment:scroll; D: ackground-repeat: repeat-x;

One can guess that in the attachment there is a(n)

One can guess that in the attachment there is a(n) ________.

Which of the following sentences are appropriate with the word “attachment”?

There should always be an attachment at the end of a business memo.

ackground-attachment属性有两个属性值,分别为scroll和fixed。( )

实现一个css3线性渐变效果,渐变的方向是从右上角到左下角,起点颜色是从白色到黑色,以下写法正确的是( )。 A: ackground:linear-gradient(225deg,rgba(0,0,0,1),rgba(255,255,255,1)); B: ackground:linear-gradient(135deg,hsla(120,100%,0%,1),hsla(240,100%,100%,1)); C: ackground:linear-gradient(to top left,white,black); D: ackground: linear-gradient(to bottom left, white, black);

背景颜色的属性 A: gcolo B: ackground C: ackground-colo