执行不同任务的航空器或者不同机型的航空器同时飞行时,应当根据具体情况,允许执行()的航空器优先起飞。
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一热机的循环效率为15%,在一次循环中从外界吸热2000J,则此热机在一次循环中所做的净功为()
The sad condition of women working as house servants around the world received much media_____early this yea
单匝平面载流线圈的面积为0.lm²,通以电流强度为0.4A的电流,该线圈的磁矩大小为()
It is essential that you__________any document carefully before signing it.