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Theory, observation and application of the geomagnetic polarity reversal and secular variation, magnetostratigraphy;
						        										 	
						        					            	
				            	地磁场倒转和长期变的理论、观测和应用以及磁性地层学;
								    				            	
				 	    						                 	youdao
				            					            						        	 
		         		 		        			         		
		          					          
		          			                            				          						        				          							        	- 
				           		
Theory, observation and application of the geomagnetic polarity reversal and secular variation, magnetostratigraphy;
						        										 	
						        					            	
				            	地磁场倒转和长期变的理论、观测和应用以及磁性地层学;
								    				            	
				 	    						                 	youdao