肺源性心脏病时心影有时可呈
A．梨形心
B．横位心
C．靴形心
D．悬滴状心
E．主动脉型心脏
参考答案：D
—How long have you _ _ the motorbike?
—For about two weeks. [ ]
B. had
C. borrowed
D. lent
电穿孔法（电转化）具有简便、快速、效率高等优点。
