学龄期儿童造血的红骨髓位于()
A.胸骨
B.尺骨
C.肱骨
D.胫骨
E.股骨
参考答案:A
— Is this your ruler?
— No, it's ____________.[ ]
A. she's
B. her
C. hers
L(+)-抗坏血酸的结构式是()
A.
B.
C.
D.
E.