如图甲所示电路中,R1是滑动变阻器,R2是定值电阻,电源两端电压保持不变.当滑动 发布时间:2017-04-21 07:16 │ 来源:www.tikuol.com 题型:填空题 问题: 如图甲所示电路中,R1是滑动变阻器,R2是定值电阻,电源两端电压保持不变.当滑动变阻器滑片P从最右端滑到最左端,电压表示数随电流变化的图象如图乙所示,则滑动变阻器的最大阻值为 _________ Ω.
题型:填空题 设M、P是两个非空集合,定义M与P的差集为M-P={x|x∈M且x∉P}.(1)设集合B={2,4,6,8},请你分别用列举法和描述法写出一个集合A,使得A-B={5};(2)请写出两组集合A、B(与(1)中集合相异),使得A-B={5};(3)从(2)中选出一组A、B,计算:A-(A-B) 在此基础上,请你写出有关集合A、B的其他运算表达式,使其结果与集合A-(A-B)相等.(至少两种,无需证明) 查看答案
题型:填空题 The book has been translated into thirty languages since it on the market in 1973.A.had comeB.has comeC.cameD.comes 查看答案
题型:填空题 -How did he ______ the punishment he was given for his cruel conduct? -No reaction at all. He knew unkindness often reacts upon the unkind person. [ ]A. respond with B. react to C. respond for D. react with 查看答案