【单选题】请解释下面代码里id属性中的内容含义 android:id="@+id/btn"
【判断题】对于共阳极结构的显示译码器,当某一字段发光二极管的阴极为低电平时,相应字段就点亮。( )
【简答题】谱例中的两个音,符合变化全音关系的有:A. B. C. D.
【单选题】Christopher bought 4 cans of soup for a total of $3.36,which included sales tax of $0.16. At the same per-can cost, what is the cost before the sales tax is added for 6 cans of the same soup?
【多选题】关于widget(组件)属性的写法,下面哪个是正确的?()
A.
android:id=”@+id/tv_username”
B.
android:layout_width=”100px”
C.
android:src=”@drawable/icon”
D.
android:id='@id/tabhost'