(15分)在人类历史发展中,经历了从专制到民主自由的漫长而又艰难的历史过程。阅读下列材料并结合所学知识回答问题。 材料一 在中国古代,人
向下列物质的溶液中通入CO2,不发生反应的是( )A. Na2CO3 B. NaHCO3 C. K2CO3 D. CaCl2
.It is a(n)________ idea to keep a machine running all the time without any power supply. A.reasonable B.absurd C.proper D.exact
–Have you got any idea what led to the result that he was turned down? --___ in the job interview, I guess. A. He did not perform well B. Because he did not perform w
下列物质的用途与性质对应关系错误的是( ) 选项ABCD 用途 金刚石做玻璃刀 石墨做电池电极 不锈钢做水壶 钛合金制造船舶设备 性质金刚石硬度大
“How much do you ____ for repairing such a pair of shoes?”“Two dollars, sir.” A. charge B. take C. cost D. spend
已知直线l1的方程为Ax+3y+C=0,直线l2的方程为2x-3y+4=0,若l1、l2的交点在y轴上,则C的值为 A.4
梅是“岁寒三友”之一,自古以来,人们对它情有独钟,请写出和梅花有关的诗句(连续的两句): ,