【单选题】下列各项可以作为幻灯片背景的是( ) 。
【简答题】Linguistics is generally defined as the scientific study of __________.
【简答题】根据句子意思填入恰当。 1. All the important discoveries are based on scientific ________ (观察) and careful research. 2. The suggestion you put forward yesterday is under ________ (考虑). 3. He has made a s________ ...
【判断题】空格串是指仅由空格字符构成的串,其长度大于等于1.
【单选题】选择路线时,相对较理想的工艺路线方式是: