【判断题】数控机床的RS232接口主要作用是用于程序的网络传输输入。( )
【单选题】在学习“电离平衡”概念之前已经学习了“化学平衡”的有关知识,根据“化学平衡”的相关知识来学习“电离平衡”,我们选择的策略是( )
【单选题】Entering the room, I found Mary _______ at the desk and _______ a letter.
【单选题】Alice is sitting ________ two students. The one on her left is Mary and the one on her right is James. [ ]
【多选题】下列明清时期的岭南园林中,属于岭南四大名园的有________。
【单选题】Mike is Mary's deskmate. He is sitting beside _____________. [ ]
【单选题】Entering the room, I found Mary ______at the desk and ______a letter.