A. 机背取景照相机 B. 单镜头反光照相机 C. 直视取景器照相机 D. 自动照相机
A. 放电电压 B. 终了电压 C. 浮充电压 D. 均充电压
An amount equal to the depth of the water B. Two times the depth of water C. Three to four times the depth of water D. Five to seven times the depth of water