若后纵韧带同时破裂，髓核可突入椎管呈游离状（） A.Schmorl结节 B.腰椎间盘

阅读短文，根据短文内容及首字母提示，在空白处填入一个适当的单词。

       Ron, the teacher at the skydiving (跳伞运动) school, was surprised when the gray-haired man said that his

name was Walter and asked if he could take skydiving lessons. Ron asked him how old he was and he

(1) r           that he was 60. Ron explained to Walter that (2) a            over 50 had to be checked by a doctor

before he could learn to jump from a plane. "I'm sorry, but I can't let you start learning (3) w            a letter

from your doctor."

       Walter smiled. "Here is a letter from my doctor. He asked me to take (4) l             of tests and he says that

I'm fine."

       So Walter was able to join the skydiving school. He came to all the lessons and worked very (5) h          .

Soon it was the time for him to make his (6) f             jump. Ron asked him if he was feeling OK. Walter

answered that he had never felt better. However, he added that there was something he should have told Ron

(7) e           . Ron asked what it was and Walter smiled. Then just before he jumped, he told Ron that he wasn't

60. Ron asked how old Walter (8) r            was and Walter told him he was 75!

       Walter has a lot of (9) h           . He enjoys riding fast motorbikes and (10) c            mountains. Last year

he was saved by a police helicopter (直升飞机) in Wales.

       His daughter Betty worries about him. "I think he should stop all these activities. But my mother says that

as long as he's happy, it's OK."

如图所示，两平行导轨ab、cd竖直放置在的匀强磁场中，匀强磁场方向竖直向上，将一根金属棒PQ放在导轨上使其水平且始终与导轨保持良好接触。现在金属棒PQ中通以变化的电流I，同时释放金属棒PQ使其运动。已知电流I随时间的关系为I=kt（k为常数，k>0），金属棒与导轨间存在摩擦。则下面关于棒的速度v、加速度a随时间变化的关系图象中，可能正确的有

学生“品德差，学习差，几乎没有合作行为，而且谁也不知道该做什么”，这是学生对（）领导方式的典型反应。

A．民主型

B．放任自流型

C．仁慈专断型

D．强硬专断型

网络操作系统的 【9】 服务是最重要与最基本的网络功能。

关于阵发性睡眠性血红蛋白尿发病机制叙述正确的是（）

A.红细胞对补体激活敏感度下降

B.GPI锚连膜蛋白过度表达

C.补体适宜pH为8.0～9.0

D.CD55和CD59因子与发病关系最密切

E.夜间发病为pH升高所致