【单选题】一个关系相当于一张二维表,二维表中的表头相当于该关系的
【单选题】The boy's feet are _______ out to an electric heater.
【单选题】一个关系相当于一个二维表,二维表中的各栏目相当于该关系的( D )。
【简答题】阅读理解。 根据短文内容,从短文后的选项中选出能填入空白处的最佳选项,选项中有两项为多余选项。 Have you ever seen any students whose trousers hang so low that you can see their underwear? What do you think of that? Fashionable? Some of today's tee...
【判断题】在人眼成像中红光的焦点居前,绿光的焦点居后。
【简答题】根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。 选项中有两项为多余选项。 Have you ever seen any students whose trousers hang so low you can see their underwear? What do you think of that? Fashionable? Some of today's agers ar...