×
单选题
537.That portion of the system which utilizes voice modulated electromagnetic waves to transmit and/or receive messages from air-to-air, or air-to-ground installations( )
A
系统中扩大声音调制电磁波来传送和/或接收空对空或空对地装置的信息的系统部分。
B
系统中利用声音调制电磁波来传送和/或接收空对空或空对地装置的信息的系统部分。
C
系统中利用音调制电磁光束来传送和/或接收空对空或空对地装置的信息的系统部分。答案解析
正确答案：B
相关题目
单选题
400.The sealant burns at 109 deg ( )
单选题
399.The first step in listing possible causes of each trouble is to show what sections of the system may be at fault ( )
单选题
398.[ ] A FORCE OF 100 N ON THE END OF THE LEVER ( )
单选题
397.That stops and starts again, not continuous( )
单选题
396.参数一定不能超过批准的误差。( )
单选题
395.They may be in loose-leaf form with a durable, multi-ring cover,permanently bound, Fiche": or another appropriate form( )"
单选题
394.sterilize the goggles( )
单选题
393.请注意,飞机推出( )
单选题
392.Adhere to the safety instructions ( )
单选题
391.Trichloroethylene is a health hazard( )
