题目

Recently,an American doctor in Liberia has been tested positive for the Ebola virus.Dr.Rick Sacra,a Christian missionary(传教士)wasn’t treating people with Ebola,but he’s in the country that’s been hardest hit by the latest Ebola outbreak.And that’s one of five things to know about this virus.It’s killed thousands in West Africa.Second point,it`s a fever.Other symptoms are muscle pain,vomiting and bleeding.It`s spread through direct contact with blood and body fluids. There’s no cure for this disease.About half of those who’ve gotten it have died.Quick treatment with fl在“测量小灯泡的电阻”的试验中，要用滑动变阻器改变被测小灯泡两端的电压．（1）滑动变阻器的连接如图2所示，闭合开关前应将滑片P移向 ______端（填A或D）（2）在虚线框内画出电路图，并连接实物图．（3）在某次试验中，电压表和电流表的连接和示数如图3所示，则小灯泡两端的电压是 ______V通过小灯泡的电流是 ______A小灯泡的电阻为 ______Ω