A、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 16px">Z2</span><span style="FONT-FAMILY: 宋体; FONT-SIZE: 16px">∑ < Z0∑ </span>
B、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 16px">Z2</span><span style="FONT-FAMILY: 宋体; FONT-SIZE: 16px">∑ = Z0∑</span>
C、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 16px">Z2∑ > Z0∑ </span>
D、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 16px">不确定</span>
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