在感染性心内膜炎的诊断中,下列选项最为重要的是()
A.连续两次血培养阳性
B.结膜出血点
C.长期发热
D.超声心动图诊断风湿性心脏病
E.脾大
参考答案:A
A shipmate suffers a heart attack and stops breathing. You must().
A.administer oxygen
B.immediately check his pulse and start CPR
C.make the victim comfortable in a bunk
D.immediately give a stimulant,by force if necesssary
何谓焊接工艺参数?手弧焊时的焊接工艺参数有哪些内容?