1. 许多物理单位常以科学家的名字命名，以科学家欧姆的名字作单位的物理量是 （）A．电压 B．电流 C．电阻
课文填空(共10空, 满分5分) 和其他危险相比较而言, 人类遭受鲨鱼攻击的几率其实是很小的. The chance of being attacked by a shark are very small ______ _______ other da
(2010·四川理综)如图所示，圆弧虚线表示正点电荷电场的等势面，相邻两等势面间的电势差相等．光滑绝缘直杆沿电场方向水平放置并固定不动，杆上
Lucy is believed to have been killed by a vampire. She was seen ________ Dracula’s castle last week and has never come out. A. enter
一元二次方程x2＝x的解是A．x＝0B．x＝1C．x1＝0,x2＝1D．x＝±1
西北地区是我国面积辽阔、资源丰富的地区，读图1回答下列问题． （1）A山脉是________ ；B高原是________；C等降水量线数值________ mm． 一般超市都可以
有人说美国在破坏这次中国革命中所扮演 的角色是：“……同英国一道悍然炮击南京，给 蒋介石以沉重的压力，加快了中国大地主、大资产阶级人物投
The weather turned out to be fine yesterday. I_____ the trouble to carry my umbrella with me. A. should have taken B. could have taken C. needn't have taken D. mustn't have taken
