【单选题】Try to get to know the function of each part. The mirror is ___
A.
the reflective device for the digital single lens camera. It is used to correct the reverse pictures on the focusing screen, so that operator can frame and focus correctly.
B.
used to reflect pictures captured by lens to upper pentaprism. (When the photographer presses the shutter, the mirror will bounce and the shutter curtain will bounce too, so that the inside sensor can sense the light and record the picture.)
C.
equivalent to an ideal film plane. Distance from the mirror to the focusing screen is equal to the distance from the mirror to the film plane.
【简答题】空气压缩机按工作原理不同可分为 式和 式。
【简答题】分析解放电源系中的他励回路、自励回路、充电回路和充电指示灯回路。
【单选题】可用于吗啡类镇痛药成病者戒毒的降压药是( )
【单选题】明星影片公司 1928 年完成影片 ,引发了中国武侠电影的第一波风潮。
【单选题】行为人超越代理权以被代理人名义订立的合同,相对人可以催告被代理人予以追认。被代理人未作表示的视为
【单选题】行为人超越代理权以被代理人名义订立的合同,相对人可以催告被代理人予以追认。被代理人未作表示的视为()
【判断题】负载作星形联接时,必有线电流等于相电流。