血清铁降低，总铁结合力增高（）
A.再生障碍性贫血
B.慢性感染性贫血
C.溶血性贫血
D.缺铁性贫血
E.铁粒幼细胞贫血
参考答案：D
已知点A（2a+1，2+a）在第二象限，则a的取值范围是（）。
When a rescuer finds an electrical burn victim in the vicinity of live electrical equipment or wiring，his first step is to（）.
A.flush water over any burned area of the patient
B.apply ointment to the burned areas on the patient
C.get assistance to shut down electrical power in the area
D.remove the patient from the vicinity of the live electrical equipment or wiring
