【单选题】
A <{p data-we-empty-p="" _msttexthash="10814024" _msthash="544"}>τ1 =τ2 ，φ1 =φ2<{/p}>
B <{p}><{font _mstmutation="1" _msttexthash="27799967" _msthash="351"}>τ1 =τ2 ，φ1 ≠ φ2 ；<{/font}><{br/}><{/p}>
C <{p}><{font _mstmutation="1" _msttexthash="27118325" _msthash="523"}>τ1 ≠τ2 ，φ1 =φ2 ；<{/font}><{br/}><{/p}>
D <{p data-we-empty-p="" _msttexthash="16416452" _msthash="307"}>τ1 ≠τ2 ，φ1 ≠ φ2 。<{/p}>
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