证券经纪人是指接受证券公司的委托,代理其从事客户招揽和客户服务等活动的证券公司以外的自然人或法人。( )
混合痔指
根据以上条件,基金B的夏普比率为(),基金C的特雷诺比率为(),基金D的詹森比率为()。
患者男,12岁,感冒后期出现咳嗽阵发,痰黏量少色黄,时咯血,烦热口苦,胸胁灼痛,急躁易怒,舌红苔薄黄,脉弦数。其辨证为
明朝隆庆年间,有人醉酒评论“宋四家”,下列说法明显错误的是( )
患者,男,48 岁。因脑外伤,在全身麻醉下行颅内探查术。术后的床单位应是( )
麻醉床,床中部和床上部各铺一橡胶单、中单
暂空床,床中部和床上部各铺一橡胶单、中单
暂空床,床中部和床尾部各铺一橡胶单、中单
麻醉床,床中部和床尾部各铺一橡胶单、中单
备用床,床中部和床上部各铺一橡胶单、中单
Passage 1 It's one of our common beliefs that mice are afraid of cats. Scientists have long known that even if a mouse has never seen a cat before, it is still able to detect chemical signals released from it and run away in fear. This has always been thought to be something that is
into a mouse's brain. But now Wendy Ingram, a graduate student at the University of California, Berkeley, has challenged this common sense. She has found a way to "cure" mice of their inborn fear of cats by infecting them with a parasite, reported the science journal Nature. The parasite, called Toxoplasma gondii, might sound unfamiliar to you, but the shocking fact is that up to one-third of people around the world are infected by it. This parasite can cause different diseases among humans, especially pregnant women-it is linked to blindness and the death of unborn babies. However, the parasite's effects on mice are unique. Ingram and her team measured how mice reacted to a cat's urine (尿) before and after it was infected by the parasite. They noted that normal mice stayed far away from the urine while mice that were infected with the parasite walked freely around the test area. But that's not all. The parasite was found to be more powerful than originally thought-even after researchers cured the mice of the infection. They no longer reacted with fear to a cat's smell, which could indicate that the infection has caused a permanent change in mice's brains. Why does a parasite change a mouse's brain instead of making it sick like it does to humans? The answer lies in evolution. "It's exciting scary to know how a parasite can manipulate a mouse's brain this way," Ingram said. But she also finds it inspiring. "Typically if you have a bacterial infection, you go to a doctor and take antibiotics and the infection is cleared and you expect all the symptoms to also go away." She said, but this study has proven that wrong. "This may have huge implications for infectious disease medicine."
The underlined part "hard-wired" in Paragraph l probably means ______.
如图所示,A、B是两质量相等的物体,原来静止在平板小车C上,A和B间夹一被压缩了的轻弹簧,A、B与平板车上表面动摩擦因数之比为3:2,地面光滑。当弹簧突然释放后,A、B相对C滑动的过程中( )。
①A、B系统动量守恒 ②A、B、c系统动量守恒
③小车向左运动 ④小车向右运动
以上说法中正确的是( )。