You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
常用的通信信道分为模拟通信信道和数字通信信道,其中数字通信信道是( )。
STM N中定帧字节为().
免费的网站请分享给朋友吧