影像增强器的增益中包括
A．缩小增益B．功率增益C．放大增益D．电压增益E．电流增益
参考答案：A
解析：由缩小增益和流量增益形成。
Read and write. （根据所给图片提示，把短文补充完整）
Look, this is my family. My father is a 1.________My grandpa is a 2.________
My mother is a 3.________.And I am a 4.________player. We are very happy.
任何图形都不可能有无数条对称轴。[ ]
My grandpa is a 2.________
.And I am a 4.________
player. We are very happy.