4岁以后儿童引起充血性心力衰竭的原因主要为()
A.急性心肌炎或心脏炎
B.遗留的慢性瓣膜病
C.川崎病
D.室间隔缺损
E.肺炎
参考答案:A, B
In front of the house _____ with a history of 100 years.
A.does a tall stand
B.stands a tall tree
C.a tall tree is standing
D.a tall tree stands
变压器在合闸时,为什么有激磁涌流?