与氮质代谢产物潴留无关的表现是（）
A.恶心、呕吐
B.皮肤瘙痒
C.出血
D.心包摩擦音
E.手足抽搐
参考答案：E
解析：手足抽搐是低钙引起的。
George returned after the war, only ________ that his wife had left him.[ ]
A. to be told
B. telling
C. being told
D. told
《铁路信号维护规则》对信号设备电气器件的绝缘电阻有何要求？
