下列疾病中不会出现血清铁降低的是
A．胃大部切除术后贫血
B．阵发性睡眠性血红蛋白尿
C．慢性感染性贫血
D．海洋性贫血
E．慢性失血性贫血
参考答案：D
One of the tennis rackets broken when they found them.[ ]
A. is
B. are
C. were
D. was
热继电器只宜作过载保护，不宜用作短路保护。（）
