如果主飞行显示故障，主飞行显示图象将被转到导航显示上：
A、自动
B、人工或自动
C、人工
D、以上都不对
参考答案：A
I'm happy that you agreed to work with us again. and I look forward to______ you next week.
[ ]
A. being seen
B. see
C. seeing
D. having seen
雷达荧光屏上的间接回波的亮度比真回波：（）
A、亮些
B、暗些
C、亮度相等
