SY-Ⅱ型密度计测量值的允许误差是（）A.±0.1kg/m3 B.±0.2kg/m3

患者，女性，48岁，患1型糖尿病30年，因感冒、体温39℃、食欲减退、恶心呕吐及腹痛而入院。

该患者病情逐渐平稳，过度为皮下胰岛素注射治疗。患者主诉最近半年来，经常感到双足趾针扎样刺痛，双足有穿着袜子的异常感觉。根据病人的病史，应考虑患者出现了何种并发症

A．下肢动脉粥样硬化

B．糖尿病肾病

C．植物神经功能紊乱

D．低血糖

E．周围神经病变

外科急腹症未明确诊断前的"四禁"指

A．禁用哌替啶止痛

B．禁饮食

C．禁服泻药

D．禁止灌肠

E．禁止针刺止痛

一个长方形的周长是30厘米，若长方形的一边用字母x（厘米）表示，则该长方形的面积是（　　）

A．x（30-2x）平方厘米

B．x（30-x）平方厘米

C．x（15-x）平方厘米

D．x（15+x）平方厘米

成年人应用普鲁卡因局麻时，一次限量为

A．500mg
B．400mg
C．1000mg
D．1200mg
E．1500mg

Lisa was running late. Lisa, 25, had a lot to do at work, plus visitors on the way : her parents were coming in for Thanksgiving from her hometown. But as she hurried down the subway stairs, she started to feel uncomfortably warn. By the time she got to the platform, Lisa felt weak and tired—maybe it hadn’t been a good idea to give blood the night before, she thought. She rested herself against a post close to the tracks. Several yards away, Frank, 43, and his girlfriend, Jennifer, found a spot close to where the front of the train would stop. They were deep in discussion about a house they were thinking of buying. But when he heard the scream, followed by someone yelling, "Oh, my God, she fell in!" Frank didn’t hesitate. He jumped down to the tracks and ran some 40 feet toward the body lying on the rails. "No! Not you!" his girlfriend screamed after him. She was right to be alarmed. By the time Frank reached Lisa, he could feel the tracks shaking and see the light coming. The train was about 20 seconds from the station.
It was hard to lift her. She was just out. But he managed to raise her the four feet to the platform so that bystanders could hold her by the grins and drag her away from the edge. That was where Lisa briefly regained consciousness, felt herself being pulled along the ground, and saw someone else holding her purse. Lisa thought she’d been robbed. A woman held her hand and a man gave his shirt to help stop the blood pouring from her head. She tried to talk but she couldn’t, and that was when she realized how much pain she was in. Police and fire officials soon arrived, and Frank told the story to an officer. Jennifer said her boyfriend was calm on their 40 minute train ride downtown—just as he had been seconds after the rescue, which made her think about her reaction at the time. "I saw the train coming and I was thinking he was going to die", she explained.

Why did Jennifer try to stop her boyfriend

A. Because they would miss their train.
B. Because he didn’t see the train coming.
C. Because she was sure Lisa was hard to lift.
D. Because she was afraid the train would kill him.