A、μ<sub>1</sub>≠μ<sub>2</sub>≠μ<sub>3</sub>
B、μ<sub>1</sub>≠μ<sub>2</sub>且μ<sub>2</sub>≠μ<sub>3</sub>
C、μ<sub>1</sub>≠μ<sub>2</sub>且μ<sub>2</sub>≠μ<sub>3</sub>且μ<sub>1</sub>≠μ<sub>3</sub>
D、μ<sub>1</sub>≠μ<sub>2</sub>且μ<sub>2</sub>≠μ<sub>3</sub>或μ<sub>1</sub>≠μ<sub>3</sub>
E、μ<sub>1</sub>≠μ<sub>2</sub>或μ<sub>2</sub>≠μ<sub>3</sub>或μ<sub>1</sub>≠μ<sub>3</sub>