A、N<sub>1</sub>=N<sub>2</sub>=N<sub>3</sub>,ε<sub>1</sub><ε<sub>2</sub><ε<sub>3</sub>
B、N<sub>1</sub><N<sub>2</sub><N<sub>3</sub>,ε<sub>1</sub><ε<sub>2</sub><ε<sub>3</sub>
C、N<sub>1</sub>=N<sub>2</sub>=N<sub>3</sub>,ε<sub>1</sub>=ε<sub>2</sub>=ε<sub>3</sub>
D、N<sub>1</sub><N<sub>2</sub><N<sub>3</sub>,ε<sub>1</sub>=ε<sub>2</sub>=ε<sub>3</sub>
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