【单选题】柴油车废气检测时,发动机首先应(),以保证检测的准确性
【单选题】以下选项中,哪个不是计算机的特点( )。
【单选题】The __________ for a particular type of thing is the number of people who want to buy it, or the area of the world in which it is sold.
【单选题】She managed to save _____ she could out of her wages to help her brother.