A、<span style="font-size:16px;font-family:宋体">0,0</span>
B、<span style="font-size:16px;font-family:宋体">0,</span><span style="font-size:16px;font-family:宋体">∞ </span>
C、<span style="font-size:16px;font-family:宋体">∞,0</span>
D、<span style="font-size:16px;font-family:宋体">∞, ∞ </span>
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