通常用于诊断的超声频率是
A.5~10MHz
B.2.5~10MHz
C.20000~75000Hz
D.7.5~10MHz
E.16~20000Hz
参考答案:B
France has ______for everyone, ______why not visit France this year?
A.everything;and
B.anything;but
C.nothing; so
D.something; so
腺垂体功能减退症最早出现功能减退的靶腺是
A.肾上腺皮质B.甲状腺C.性腺D.肾上腺与甲状腺E.甲状腺与性腺