8、有关产褥感染下列哪项是正确的
A、A．指产后生殖器宫感染后，引起局部和全身的炎性变化
B、B．多为单种细菌感染
C、C．凡产褥期体温升高均为生殖器感染所致
D、D．产后未发生产褥感染，宫腔内培养不出细菌
E、E．以上都不正确

Given communication principle, activities designed for ...

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A、正确
B、错误

can transfer S_{1}  into a horseshoe__________[填空1]____...

单项选择题
can transfer S_{1}  into a horseshoe__________[填空1]______________________________, explain your reason______________[填空2]________________________________________________

２．反应器开发的关键是研究反应网络。 A、正确 B、错误

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A、正确
B、错误