_______ is the population of China?
A.How much
B.How many
C.How many people
D.What
答案:D
下列先天性心脏病,属于无分流型的是()
A.房间隔缺损
B.室间隔缺损
C.动脉导管未闭
D.法洛四联症
E.肺动脉狭窄
光固化复合树脂充填时,分层光照每层的厚度不超过
A.1.5mmB.0.5mmC.1.0mmD.2.0mmE.2.5mm