[单项选择]MRI扫描前应指导病人（）
A. 禁食4小时
B. 多饮水
C. 去掉病人随身携带的金属物件
D. 前1日进清淡饮食
E. 排空膀胱

留置尿管

静脉输血

静脉输液

心理护理

The fridge is considered a necessity. It has been so since the 1960s when packaged food first appeared with the label: "store in the refrigerator."
In my fridgeless fifties childhood, I was fed well and healthily. The milkman came daily, the grocer, the butcher (肉商), the baker, and the ice-cream man delivered two or three times a week. The Sunday meat would until Wednesday and surplus (剩余) bread and milk became all kinds of cakes. Nothing was wasted, and we were never troubled by rotten food. Thirty years on food deliveries have ceased, fresh vegetables are almost unobtainable in the country.
The invention of the fridge contributed comparatively little to the art of food preservation. A vast way of well-tried techniques already existed—nature cooling, drying, smoking, salting, sugaring, bottling.
What refrigeration did promote was marketing—marketing hardware and electricity, marketing soft drinks, marketing dead bodies of animals aro
A. People would not buy more food than was necessary.
B. Food was delivered to people two or three times a week.
C. Food was sold fresh and did not get rotten easily.
D. People had effective ways to preserve their food.

患者女，29岁。于2个月前发热，牙龈出血，头晕，心悸，月经过多，医务室给止血药，效果不佳，近1月来出血更多，昨天呕出咖啡样液体约500ml，急诊入院。查体：贫血貌，心肺肝脾均无异常，化验WBC2.3×10⁹／L、RBC2.69×10¹²／L、PLT33×10⁹／L、Hb75g／L，网织红细胞低于正常，大便隐血强阳性，骨髓增生不良。

患者，27岁，生育史：0-0-0-0，停经2个月，不规则少量阴道流血5天。检查：子宫如妊娠3个月，双侧附件扪及儿头大的囊性肿物。拟诊“葡萄胎”收入院，患者忧心忡忡，不知所措。