The reason why the laser beam is very strong is that
A.it is artificially illuminated
B.it is made up of a concentrated beam of light
C.it sends out heat in all directions
D.its heat is increased by the heat of the sun
第1题
下列哪种不是左向右分流的先天性心脏病
A、房间隔缺损
B、室间隔缺损
C、动脉导管未闭
D、心内膜垫缺损
E、法洛四联症
第8题
婴幼儿左向右分流先天性心脏病最常见的并发症是
A、支气管肺炎
B、心力衰竭
C、脑栓塞
D、心律失常
E、感染性心内膜炎
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