Before the oily water is installed on board ships, it must have （） ["IOPP","type approval certificate","cargo ship safety equipment certificate","cargo ship safety certificate"]
1978年大纲的显著特点是中学提出“文学”与“汉语”分科，小学要求加强“汉语教学”。
用户不能在Windows桌面上创建文件夹。
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。
什么叫断路器慢分？LW6（FA4）型断路器“失压防慢分”是如何实现的？
