单项选择题 在一条走廊内布置一条800mm和1000mm宽的带式输送机，那么输送机的中心线距最近的墙的最小距离要（）mm，两条输送机的中心线要（）mm才能符合要求。 A. 1350；2400 B. 1250；2400 C. 1200；2600 D. 1400；2600

判断题 图样中有一孔，如果沿江有标注其圆度公差要求，那么它的圆度误差值可任意确定。

单项选择题 Read the statements and answer choices. Then listen to a group of students discussing a group project for a class. There is a place in the conversation where information is missing. Listen and choose the best answer using context clues. During the first missing part after one of the women said,"that sounds good to me, but first...", the students were probably discussing__________. 109 A、the topic of the presentation B、the importance of Celtic music C、the role of each group member D、/