【判断题】The first law of thermodynamics is essentially an expression of the conservation of energy principle, also called the energy balance. The general mass and energy balances for any system undergoing any...
【单选题】听力原文:W: Harry! What's the matter? You look pale. Are you sick? M: I just had a terrible experience. W: Sit down. Let me get you a glass of water. M: No thanks, I'll be fine in a minute. W: Did you hav...
【简答题】When the boys 1 home, it was eleven o'clock. It was dark 2 but there was a light inside their home and the door 3 . They could see a man inside. "Who can 4 be?" Said Peter. "Mother and father 5 to do ...
【简答题】One day Bob took two of his friends into the mountains. They put up their tents and then rode off to a forest to see how the trees were growing. In the afternoon when they were about ten kilometres fr...