小型空分设备分馏塔怎样进行加温？
题型：问答题 简答题
问题：
小型空分设备分馏塔怎样进行加温？
题型：问答题 简答题
根据所给表格仿照例子写句子。
Today is June third. This is Li Ming's day.
Now it is June fourth. What did Li Ming do yesterday?
例: He walked to school at eight thirty on June third.
1. He ______to Miss Zhang at _______ on June third.
2. He ______at a map at _______ on June third.
3. He ______to a picture at _______ on June third.
4. He ______Jenny at ______ on June third.
5. He ______ with a ball at ______ on June third.
，该三角形平面与电场线平行，O为三条中线AE、BF、CD的交点。将一电荷量为2．0×10-8 C的正点电荷从A点移动到C点，电场力做的功为6.0×10-7J；将该点电荷从C点移动到B点，克服电场力做功为4.0×10-7 J，设C点电势为零。由上述信息通过计算或作图不能确定的是