李明同学患了肺炎,医生采用上肢静脉注射青霉素的方法进行治疗,青霉素最先到达心脏的哪一个腔 [ ]
A.左心房
B.右心房
C.左心室
D.右心室
答案:B
In April, 2009, President Hu inspected the warships in Qingdao,____ the 60th anniversary of the
founding of the PLA Navy. [ ]
A. marking
B. marked
C. having marked
D. being marked
下列关于串行化说法有误的是( )。
A.I=4 x=5
B.I=7 x=15
C.I=6 x=8
D.I=7 x=11