【判断题】The country that produces the most fresh vegetables in the world is China.
【简答题】螺纹的旋合长度有__________、__________和长旋合长度。
【判断题】物流配送是衔接干线运输与末端运输的有效形式。
【单选题】Three Gorges Dam produces _______ for millions of people in China.
【简答题】China produces_________ percent more steel than the United States.