My mother spent about 2,000 dollars ______ the piano.[ ]
A. in
B. at
C. for
D. on
答案:D
原发性甲状旁腺功能亢进症患者病变甲状旁腺术前定位检查首选()。
A.颈部触诊
B.颈胸部CT
C.颈胸部MRI
D.99mTc甲氧基异丁基异腈甲状旁腺扫描
E.选择性甲状腺静脉取血测PTH
压卡式单动双管有些什么特点?