女性，56岁。诊断肺心病3年，2天前受凉后发热，咳嗽，咳痰加重，咳黄痰，呼吸困难，不

According to the passage, the author likes being with those______.

A．fat people who are clumsy and slow in movement and gets fed up with those quick and sensitive thin people

B．thin people who are always energetic and active and those fat people, too, who are steady in the moves they take

C．fat people who are inactive and easily get jaded but hates to be among those thin people who are active and energetic

D．thin people who get rid of things quickly but feels sick of those fat people who are all thumbs

大量输血后，易导致出血倾向是由于（）

A.库血中血小板破坏

B.血钙浓度降低

C.酸性物质增多

D.钾离子浓度增高

E.钠离子浓度增高

作为质量管理的一部分，包括（）活动。

A.质量策划

B.质量控制

C.质量改进

D.质量保证

安全标志用简明醒目的颜色、几何图形符号并辅以必要的文字说明，以提醒警告人们防止危险，注意安全。

三相异步电动机所产生的旋转磁场的转速公式是什么？