In modern fathometers the sonic or ultrasonic sound waves are produced electrically by means of a(n)（）. ["transmitter","transducer","transceiver","amplifier"]
在识字教学中多媒体的运用，有利于及时反馈，及时调整教学过程和方法，收到事半功倍效果，所以多多益善。
在Windows操作系统中，可以用键盘来执行菜单命令。
“1+1+N”联动营销模式中不包括的人员是（）
The International Air Pollution Prevention Certificate (IAPP) is issued to（） ["ships of above 200 GT to MARPOL","every ship of 400 GT and above","all ships","ships of more than 200 GT but less 400 GT"]
LW6型断路器有哪些防慢分的措施？
