Song Zuying is famous ______ folk songs. [ ]
A. for
B. as
C. with
答案:A
临床上最常见的心音分裂是().
A.S2通常分裂
B.S2生理分裂
C.S2固定分裂
D.S1分裂
E.S2反常分裂
目前常见的对讲机分为专业机和民用机两大类。