无人机定高平飞时,驾驶员面对地面站界面()
A.切至自主控制模式,尽可放松休息
B.短暂休息,偶尔关注一下飞机状态
C.密切判断飞机的俯仰状态和有无坡度
参考答案:C
变压器的简化等值电路适用于()。
A.稳态空载和负载;
B.稳态负载;
C.突然短路;
D.开路。
33.The big city has always been the dream career destination of college students. But of late a trend of heading back home ________a part of future job considerations.
A.has become
B.had become
C.becomes
D.will become