1.能与氨水反应的弱电解质是 A.醋酸溶液 B.硫化氢 C.二氧化硫 D.硫酸铜
1. Where does the conversation take place? A. At the man’s house. B. At the airport. C. At a hotel. 2. What does the man think of those magazines? A. They are informative. B. They aren’t worth buying. C. They are useless for the decoration.
一、语文基础知识及运用(每小题3分,共30分) 1、下列加点字注音完全正确的一项是( ) A、流憩qì 东皋gāo 睇眄miǎn 犹蒙矜育jīn 茕茕孑立qióng B、舸舰kē 潦水láo 遄飞chuán 白云出岫yòu 宠命优渥wò C、绣闼dá 晦朔huì 盘桓huán 决起而飞jué 命途多舛chuǎn D、夭阏è 骖騑cān 泠然lěng 门衰祚薄zuò 晨光熹微xī
1.When did the rain start? A. About 6pm B. About 6am C. About 12pm
一、选择题(本题共10小题,每题只有一个选项符合题意,每题3分,共30分。) 1、关于库仑定律,下列说法中正确的是( ) A.库仑定律适用于点电荷,点电荷其实就是体积很小的球体 B.根据F= ,当两电荷的距离趋近于零时,静电力将趋向无穷大 C.若点电荷q1的电荷量大于q2的电荷量,则q1对q2的静电力大于q2对q1的静电力 D.库仑定律和万有引力定律的表达式相似,都是二次方反比定律
2.某反应2AB(g)C(g)+3D(g)在高温时能自发进行,其逆反应在低温下能自发进行,则该反应的ΔH、ΔS应为( ) A.ΔH <0,ΔS>0 B.ΔH <0,ΔS<0 C.ΔH >0,ΔS>0 D.ΔH >0,ΔS<0
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