女性，44岁，耳鸣、头痛3年。CT示小脑桥脑角可见一圆形肿块，并有明显强化，相应侧的桥小脑角池增宽，内听道口扩大。
有关该肿瘤的叙述错误的是（）。
A.多见于儿童、青少年
B.小脑、第四脑室底部、第三脑室、丘脑、视神经为好发部位
C.镜下：如间质中血管增生明显则为高度恶性
D.生长极为缓慢
E.预后好
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在旅游经济运行不可缺少的条件中，（ ）是个人条件。
A．社会经济发展水平
B．旅游吸引物状况
C．旅游服务水平
D．旅游者方面的条件
| 如图为理想变压器原线圈所接交流电压的波形．原、副线圈匝数比n1：n2=10：1，串联在原线圈电路中电流表的示数为1A，下列说法正确的是（ ） A．变压器输出端所接电压表的示数为20 B．变压器的输出功率为200W C．变压器输出端的交流电的频率为50Hz D．穿过变压器铁芯的磁通量变化率的最大值为20 |
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.
When did Lisa become conscious again（）
A．When the train was leaving.
B．After she was back on the platform.
C．After the police and fire officials came.
D．When a man was cleaning the blood from her hea
肺部X线表现为游走性浸润是（）
A.金黄色葡萄球菌肺炎
B.肺炎葡萄球菌肺炎
C.肺炎支原体肺炎
D.病毒性肺炎
E.以上都不是
如何判定滑坡的危险性？