复背斜和复向斜
由许多级褶皱所组成的巨大背斜和巨大向斜,各次级褶皱与总体88褶皱有一定几何关系,典型复背斜和复向斜的次级褶皱轴面常向该复背斜和复向斜的核部收敛。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
免费的网站请分享给朋友吧