为什么带式输送机必须安装清扫器?
参考答案:
安装清扫器可防止煤粉粘在传动滚筒表面,造成输送带磨损过快,也可避免因两个传动滚筒直径有差异而造成电动机功率分配不均。
根据短文内容,判断正(T)误(F)。
Last Sunday the Greens went to the movies. They got home very late. Father opened the front door and went into the house. It was very dark, so mother turned on the light. On the way to their bedroom, mother said, “Listen, John! I can hear someone in the bedroom. ” They all stood quietly outside the bedroom. They could hear some voices in the room.
“You are right. ” father said, “There are two men in it. They are talking. ” Then he shouted, “Who’s there?” But no one answered. Father opened the door quickly and turned on the light. The room was empty. Then father found something and laughed. “The TV is still on. I forgot to turn it off this morning!” father said.
小题1:The Greens got home very early.
小题2:On the way to their bedroom, mother heard someone in the bedroom.
小题3:They all stood quietly in the bedroom.
小题4:There were really two men talking in the room.
小题5:Father opened the door slowly and turned on the light.
男性,45岁,乙型肝炎后肝硬化病史5年,患者间断出现双下肢水肿。近两年来反复出现腹水,治疗效果差。近日因黄疸加重、合并自发性腹膜炎入院。入院后查患者有高血钠。
该患者钠潴留的最主要原因是()
A.钠负荷增加
B.ADH分泌增加
C.心房肽合成增加
D.醛固酮分泌增加,降解减少
E.交感神经系统兴奋