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【简答题】
硫磺在科学技术和生产中有重要的应用。石硫合剂是一种很好的植物杀虫剂,它是硫磺与石灰、水等反应所得――由多硫化钙[ CaS x (x≤5)]、硫代硫酸钙组成的混合物。不同比例的石灰和硫磺在水溶液中反应,可生成不同的多硫化钙和硫代硫酸钙。如: 3Ca(OH) 2 +8S 2CaS 3 +CaS 2 O 3 +3H 2 O ; 3Ca(OH) 2 +6S 2CaS 2 +CaS 2 O 3 +3H 2 O 等。 根据题意完成下列计算: (1)、硫磺溶解在硫化钠溶液中生成一种多硫化物,该多硫化物中硫元素的质量分数为0.736,通过计算确定Na 2 S x 中x= 。 (2)、取某石硫合剂(假如只含两种含硫化合物)250mL(密度为1.12g/mL)通入足量CO 2 使其快速分解。原理如下: S x 2- +2H 2 O+2CO 2 →(x-1)S↓+H 2 S↑+ 2HCO 3 - ,S 2 O 3 2- + H 2 O+CO 2 →HSO 3 - +HCO 3 - +S↓ 。 完全反应后共收集到气体1.12升(S·P·T)(忽略气体在溶液中的溶解),则该石硫合剂中多硫化钙的物质的量浓度为 ;硫代硫酸钙的质量分数为 。(答案用小数表示,保留2位有效数字) (3)、如果把生石灰、硫磺和水按质量比7:16:70的配比完全反应后,只生成两种含硫的化合物,则该石硫合剂中多硫化钙与硫代硫酸钙的物质的量之比是 ;多硫化钙的化学式是 。 (4)、现有生石灰50.4g、硫磺96g、水504g恰好完全反应生成三种多硫化钙,除生成CaS 4 之外还有二种多硫化钙。请推算这二种多硫化钙可能的物质的量之比(写出推算过程)。
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【多选题】教育的双重文化属性是指( )。
A.
教育是一种文化现象
B.
与文化相互制约
C.
传递和深化文化
D.
构成文化本体
E.
对生产力具有促进作用
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【单选题】[7-10]The actual amount of cargo loaded depends upon ___.已装货物的实际数量取决于实际亏舱数
A.
the broken stowage listed列出的亏舱数量
B.
the broken stowage calculated计算的亏舱数量
C.
the broken stowage given已给的亏舱数量
D.
the actual broken stowage 实际亏舱数量___
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【单选题】小二咽鼓管的特点是
A.
较粗、短、平直
B.
较细长
C.
较细短
D.
较粗长
E.
腔较小
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【判断题】An argument is a good argument if the evidence is a common knowledge.
A.
正确
B.
错误
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【简答题】A 公司属于工业企业,为增值税一般纳税人,适用 17% 的增值税税率,售价中均不包含增值税,商品销售时,同时结转成本,本年利润采用表结法结转, 2017年年末未分配利润贷方余额为 150 万元,适用的所得税税率是 25% 。 2017年11月30日损益类有关科目累计发生额如下表所示: 单位:万元 科目名称 借方发生额 贷方发生额 主营业务收入 1650 主营业务成本 1320 其他业务收入 160...
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【单选题】A good test for whether a term is an argument marker is to
A.
substitute another argument marker and see whether the sentence still means the same as the original sentence.
B.
swap the position of the clauses on either side of the term and see if the sentence still means the same as the original sentence.
C.
determine whether the clause before the term is a premise in the argument.
D.
determine whether the clause after the term is a premise in the argument.
查看完整题目与答案
【单选题】A good test for whether a term is an argument marker is to swap the position of the clauses on either side of the term and see if the sentence still means the same as the original sentence.
A.
substitute another argument marker and see whether the sentence still means the same as the original sentence.
B.
C.
determine whether the clause before the term is a premise in the argument.
D.
determine whether the clause after the term is a premise in the argument.
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【单选题】What is a good argument?
A.
A set of premises that together support a morally good conclusion;
B.
An impassioned dispute between two or more individuals
C.
A set of premises that together make the conclusion likely to be true
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【单选题】To refute an argument is to show that
A.
it is unsuccessful.
B.
its premises do not follow from its conclusion.
C.
it is practically useless.
D.
it is irrefutable.
E.
its conclusion is among its premises.
查看完整题目与答案
【单选题】A good test for whether a term is an argument marker is tothe sentence still means the same as the original sentence.
A.
substitute another argument marker and see whether the sentence still means the same as the original sentence.
B.
swap the position of the clauses on either side of the term and see if
C.
determine whether the clause before the term is a premise in the argument.
D.
determine whether the clause after the term is a premise in the argument.
查看完整题目与答案
相关题目：
【多选题】教育的双重文化属性是指( )。
A.
教育是一种文化现象
B.
与文化相互制约
C.
传递和深化文化
D.
构成文化本体
E.
对生产力具有促进作用
查看完整题目与答案
【单选题】[7-10]The actual amount of cargo loaded depends upon ___.已装货物的实际数量取决于实际亏舱数
A.
the broken stowage listed列出的亏舱数量
B.
the broken stowage calculated计算的亏舱数量
C.
the broken stowage given已给的亏舱数量
D.
the actual broken stowage 实际亏舱数量___
查看完整题目与答案
【单选题】小二咽鼓管的特点是
A.
较粗、短、平直
B.
较细长
C.
较细短
D.
较粗长
E.
腔较小
查看完整题目与答案
【判断题】An argument is a good argument if the evidence is a common knowledge.
A.
正确
B.
错误
查看完整题目与答案
【简答题】A 公司属于工业企业,为增值税一般纳税人,适用 17% 的增值税税率,售价中均不包含增值税,商品销售时,同时结转成本,本年利润采用表结法结转, 2017年年末未分配利润贷方余额为 150 万元,适用的所得税税率是 25% 。 2017年11月30日损益类有关科目累计发生额如下表所示: 单位:万元 科目名称 借方发生额 贷方发生额 主营业务收入 1650 主营业务成本 1320 其他业务收入 160...
查看完整题目与答案
【单选题】A good test for whether a term is an argument marker is to
A.
substitute another argument marker and see whether the sentence still means the same as the original sentence.
B.
swap the position of the clauses on either side of the term and see if the sentence still means the same as the original sentence.
C.
determine whether the clause before the term is a premise in the argument.
D.
determine whether the clause after the term is a premise in the argument.
查看完整题目与答案
【单选题】A good test for whether a term is an argument marker is to swap the position of the clauses on either side of the term and see if the sentence still means the same as the original sentence.
A.
substitute another argument marker and see whether the sentence still means the same as the original sentence.
B.
C.
determine whether the clause before the term is a premise in the argument.
D.
determine whether the clause after the term is a premise in the argument.
查看完整题目与答案
【单选题】What is a good argument?
A.
A set of premises that together support a morally good conclusion;
B.
An impassioned dispute between two or more individuals
C.
A set of premises that together make the conclusion likely to be true
查看完整题目与答案
【单选题】To refute an argument is to show that
A.
it is unsuccessful.
B.
its premises do not follow from its conclusion.
C.
it is practically useless.
D.
it is irrefutable.
E.
its conclusion is among its premises.
查看完整题目与答案
【单选题】A good test for whether a term is an argument marker is tothe sentence still means the same as the original sentence.
A.
substitute another argument marker and see whether the sentence still means the same as the original sentence.
B.
swap the position of the clauses on either side of the term and see if
C.
determine whether the clause before the term is a premise in the argument.
D.
determine whether the clause after the term is a premise in the argument.
查看完整题目与答案