【单选题】
A <{p}><{font _mstmutation="1" _msttexthash="14623362" _msthash="475"}>①、②均成立;<{/font}><{br/}><{/p}>
B <{p}><{font _mstmutation="1" _msttexthash="18216419" _msthash="351"}>①、②均不成立;<{/font}><{br/}><{/p}>
C <{p}><{font _mstmutation="1" _msttexthash="34967361" _msthash="523"}>①不成立,②成立;；<{/font}><{br/}><{/p}>
D <{p data-we-empty-p="" _msttexthash="21554364" _msthash="307"}>①成立,②不成立<{/p}>
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