纯电感L、电容C串联接于某正玄交流电流中，UL=30V，UC=40V，则这个电路的总电压U为（）
参考答案：-10V
在噪音很大的机舱舱室内的报警设备发出报警的特点是（）
A.只需有足够大的音响
B.只有足够明显的灯光信号
C.需有足够大的音响还附有灯光信号
D.上述都不对
Shortly after being admitted to the coronary care unit with an acute myocardial infarction (MI), a client reports midsternal chest pain radiating down the left arm. The nurse notices that the client is restless and slightly diaphoretic, and measures a temperature of 99. 6°F (37.6℃), a heart rate of 102 beats/minute; regular, slightly labored respirations at 26 breaths/minute; and a blood pressure of 150/90mmHg. Which nursing diagnosis takes highest priority（）
A. Risk for imbalanced body temperature.
B. Decreased cardiac output.
C. Anxiety.
D. Acute pain.
