下列哪种疾病不出现左心房增大()
A.二尖瓣狭窄
B.肺动脉瓣狭窄
C.二尖瓣关闭不全
D.室间隔缺损
E.动脉导管未闭
参考答案:B
It was_____he was ill that he was absent yesterday.
A.because
B.as
C.since
D.now that
J2SDK的RMI命令有4个,其中用于激活系统守候进程,以便能够在Java虚拟机上注册和激活对象的是 【13】 。