影像板的组成包括（）
A.板基
B.光电阴极
C.荧光体层
D.保护层
E.输出屏
参考答案：A, C, D
三角形两边长分别是3和5，则周长L的取值范围是[ ]
A．6<L<15
B．6<L<16
C．11<L<13
D．10<L<16
— Do you play football after work? — Yes, _____. Playing football is not my favorite sport.
A．more or less
B．once in a while
C．sooner or later
D．time and time again
