成人胸外心脏按压的部位是胸骨上段。
参考答案:错
—Mary could swim when she was six years old.
--- .
A.So could I
B.So did I
C.So I could
D.So was I
补钙药物乐力胶囊的主要成分是()
A.无机钙
B.有机钙
C.天然钙
D.氨基酸螯合钙