已知A,B 分别为曲线C： +=1（y0,a>0）与x轴的左、右两个交点，直线过点B,且与轴垂直，S为上异于点B的一点，连结AS交曲线C于点T. (1)若曲线C为半圆，点T
Watson entered Mr. Smith's office. The boss was a hard man. He fired people who didn't do well without giving them a second chance. “Watson,” said Mr. Smith, “this past year your departmen
Friendship can deeply affect the physical and mental health of both men and women. Studies show that people who have no friends or who are lonely, are more likely to die earlier, get sick more ofte
在一定条件下进行下列化学反应，请根据以下的转化关系回答下列问题， 已知A、B、C中均含有同一种元素，D为非金属单质，能使带有火星的木条复燃
（6分）如图所示，足够长的光滑金属框竖直放置，框宽L＝0.5 m框的电阻不计，匀强磁场磁感应强度B＝1 T，方向与框面垂直，金属棒MN的质量为100 g，电
设为双曲线上的一点，是该双曲线的两个焦点，若，则的面积为（ ） A． B． C． D．
在探究“决定电阻大小因素”的实验中，运用的物理研究方法是 ；在制作导线和电阻丝时主要是根据导体的 对电阻大小的影响来选
(09·上海C篇) “Get your hands off me, I have been stolen,” the laptop, a portable computer, shouted. That is a new solution to laptop computer theft: a program that lets owners give their
