青霉素过敏的机制是()
A.Ⅰ型变态反应
B.Ⅱ型变态反应
C.Ⅲ型变态反应
D.Ⅳ型变态反应
E.以上都不是
参考答案:C
对于热处理的焊前预热,当焊接壁厚大于15mm的黄铜时,预热温度为()。
A.150~250℃
B.250~450℃
C.550℃
D.400~500℃
A client with left-sided heart failure complains of increasing shortness of breath and is agitated and coughing up pink-tinged, foamy sputum. The nurse should recognize these as signs and symptoms of()
A. right-sided heart failure.
B. acute pulmonary edema.
C. pneumonia.
D. cardiogenic shock.