Which are the colours of life-saving appliances?
A: Orange, green or yellow.
B: Orange, red or yellow.
C: Orange, blue or green.
D: Orange, yellow or green.
A: Orange, green or yellow.
B: Orange, red or yellow.
C: Orange, blue or green.
D: Orange, yellow or green.
举一反三
- The hydrated nickel(II) ion is A: blue B: yellow C: orange D: colourless E: green
- Which color indicates the harmony between nature and human-beings? A: red and green or blue B: dark blue and yellow or brown C: blue and red or orange D: black and purple or pink
- 假设定义了：enum color {red=1, orange, yellow, green ,blue, purple, black};则blue的值是（
- 下列源代码用于设置一个<;div>;元素的样式。再增加( )就可以获得如下图像。 div { width: 100px; height: 100px; border-style: solid; border-width: 5px; }[img=110x110]17e443a8753385d.png[/img] A: border-color: green blue orange red; B: border-color: blue orange red green; C: border-color: red green blue orange; D: border-color: orange red green blue;
- 假设定义了：enumcolor{red=1,orange,yellow,green,blue,purple,black};则blue的值是（） A: 4 B: 5 C: 3 D: 6