在起动APU时，电瓶充电机将会（）
A.通电输出
B.断开输入电源
C.正常工作
D.断开输出电
参考答案：B
Which of the following laboratory tests is considered the most reliable indicator of renal function
A. BUN.B. Urinalysis.C. Serum potassium.D. Serum creatinin
效价强度最强的镇痛药物是
A．吗啡
B．哌替啶
C．芬太尼
D．喷他佐辛
E．美沙酮
