单项选择题

飞机交流电源系统四个环节中，属于电网系统的是

A．发电和输电
B．发电和配电
C．配电和用电
D． 配电和输电
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单项选择题
People who have raw beef will easily get Taenia saginata but be safe if take the beef jerky.
A.正确
B.错误
单项选择题
Cystic echinococcosis mainly cycles between domestic cattle sheep and dogs, while alveolar echinococcosis cycles between wild rodents and foxes wolfs.
A.正确
B.错误
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