【单选题】I don‘t know when she ___ back, but give her the message if she comes in before two.
【单选题】—When did you go to the Palace Museum? —____________. [ ]
【判断题】单作用叶片泵的转子每回转1周,每个密封容积完成2次吸油和压油
【简答题】It was two days later __________ they began to discuss my suggestion. A) when B) that C) what D) on which
【判断题】单作用叶片泵的转子每转 1周,每个密封容积完成2次吸油和压油。
【单选题】比特(Bit)是下列哪一层的协议数据单元( )。
【单选题】When doves are about two weeks old, they are covered with grey feathers and are ready to try their wings.