中性点
参考答案：
钻柱上轴向力等于零的点称为钻柱中性点。
The hospital ______ well, where many wounded ______ every day.[ ]
A. is operated, operation
B. operates, are operated on
C. operates; are operated
D. operates; operates on
韩国画廊及艺术品聚集地的文化街是哪里？
