A.12
B.14
C.16
D.20
[单选题]A.abB.cbC.lbD.lc
[单选题]A.abB.cbC.lbD.lc
[单选题]A.abB.cbC.lbD.lc
[单选题]A.abB.cbC.lbD.lc
[单选题]( )。A.6B.7C.8D.10
[单选题]A.二尖瓣B.三尖瓣C.主动脉瓣D.肺动脉瓣E.以上均是
[单选题]( ).A.B.C.D.
[单选题]( ).A.B.C.D.
[单选题]( ).A.B.C.D.
[单选题]A.条件(1)充分,但条件(2)不充分B.条件(2)充分,但条件(1)不充分C.条件(1)和条件(2)单独都不充分,但条件(1)和条件(2)联合起来充