下列哪项血气分析变化符合Ⅱ型呼吸衰竭

A．{{*HTML*}}PaO<SUB>2</SUB>＜50mmHg，PaCO<SUB>2</SUB>＞40mmHg
B．{{*HTML*}}PaO<SUB>2</SUB>＜55mmHg，PaCO<SUB>2</SUB>＞45mmHg
C．{{*HTML*}}PaO<SUB>2</SUB>＜60mmHg，PaCO<SUB>2</SUB>＞50mmHg
D．{{*HTML*}}PaO<SUB>2</SUB>＜65mmHg，PaCO<SUB>2</SUB>＞55mmHg
E．{{*HTML*}}PaO<SUB>2</SUB>＜70mmHg，PaCO<SUB>2</SUB>＞60mmHg