A.HCoV-229E B.HCoV-OC43 C.SARS-CoV D.MERS-CoV E.HCoV-NL63、HCoV-HKU1
A. 对 B. 错
A. 互素 B. 相反数 C. 互合 D. 不互素
A. Standupstraight. B. Openyourmouthanddropyourlowerjaw. C. Breathewithyourdiaphragm. D. Findyourloudestvoice.