The domestic fresh water pump starters are controlled by pressure switches which operate when the pressure in the tank varies within predetermined limits as water is drawn offThe word “which” means _____.
【简答题】Martin is an American boy. He’s eight years old. One evening, jimmy, one of his classmates, came to his home with an exercise book in his hand. “Could you help me 1 this math problem?” Jimmy said as s...
【简答题】短文改错 While visit France, we decide to do some shopping. Not far from the hotel there was a shop with all kind of clothing hanging up. When we went into a shop, a woman came up and asked she could help...