常见的APG40分为两种硬件型号,分别为()和().
参考答案:C4,C2
根据下列对话选择正确的图片。
( ) 1. — Where is my cat? — Oh, it's near the chair.
( ) 2. — Where is the apple? — It's on the desk.
在同一方向水平角观测时,若盘左读数为90°13’00",则盘右读数应为180°13’00"。( )