下列哪种情况常有震颤
A.主动脉瓣关闭不全
B.肺动脉瓣关闭不全
C.动脉导管关闭
D.二尖瓣关闭不全
E.三尖瓣关闭不全
参考答案:C
There _______ a big garden and many buildings near our school.
A.are
B.has
C.have
D.is
肝细胞的三个功能面是()、()和()。