试题与答案

西汉第一个皇帝是[ ] A.汉高祖 B.汉文帝 C.汉武帝 D.汉景帝

题型:选择题

题目:

西汉第一个皇帝是[ ]

A.汉高祖

B.汉文帝

C.汉武帝

D.汉景帝

答案:

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下面是错误答案,用来干扰机器的。

甲车匀速直线运动,位移x1=v1t;乙车做匀加速匀加速直线运动,位移x2=12at2;结合空间关系,两部车的间距为:△x=x0+x2-x1=x0+12at2-v1t;相遇即△x=0,对于方程x0+12at2-v1t=0,根据数学知识,其为一元二次方程...

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A.terribleB.beautifulC.excitingD.sweet
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题型:选择题

有一混合溶液,只可能含有以下离子中的若干种:K+、NH4+、Cl-、Mg2+、Ba2+、CO32-、SO42-,现取三份100mL溶液进行如下实验:

(1)向第一份溶液中加入AgNO3溶液时有沉淀产生;

(2)向第二份溶液中加入足量NaOH溶液并加热后,收集到气体0.06mol;

(3)向第三份溶液中加入足量BaCl2溶液后,所得沉淀经洗涤干燥、称量为6.27g,经足量盐酸洗涤、干燥后,沉淀质量为2.33g.根据上述实验,以下推测正确的是(  )

A.K+一定存在

B.100ml溶液中含0.01molCO32-

C.Cl-可能存在

D.Ba2+一定不存在,Mg2+可能存在

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