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甲公司2018年5月经人介绍认识乙公司业务员丙，经协商由乙供甲美的空调40台。丙未经单位同意就口头承诺，甲即交丙空白支票一张，丙填写为57200上，回单位后入乙公司帐。乙公司给甲公司发了部分货后，23500元货未供，后甲几次催乙供货或退款。此事是丙所为，双方没有合同与其无关为由拒绝。甲诉至法院。问:丙是什么行为?合同是否有效?乙是否承担责任?
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参考答案：
举一反三
【单选题】The existence of external economies of scale _______.
A.
tends to result in large profits for each firm.
B.
may be associated with a perfectly competitive industry.
C.
cannot be associated with a perfectly competitive industry.
D.
tends to result in one huge monopoly.
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【简答题】External economies外部经济
查看完整题目与答案
【单选题】The existence of external economies of scale
A.
may be associated with a perfectly competitive industry.
B.
cannot be associated with a perfectly competitive industry.
C.
tends to result in one huge monopoly.
D.
tends to result in large profits for each firm.
E.
focuses more on individual firms than the industry as a whole.
查看完整题目与答案
【多选题】停留服务期间。全陪应做好协助地陪的各项工作,保障旅游者的安全包括一下哪些方面()
A.
汇报旅游团情况，配合地陪做好工作
B.
维护保障游客的安全
C.
检查各站的服务质量
D.
增加游客的购物次数
查看完整题目与答案
【单选题】External economies of scale ( )
A.
may be associated with a perfectly competitive industry.
B.
cannot be associated with a perfectly competitive industry.
C.
tends to result in one huge monopoly.
D.
tends to result in large profits for each firm.
查看完整题目与答案
【判断题】对慕课课程设计者来说，了解论坛参与者的特征、行为和利用论坛的方法，可以找出现有课程的不足，还可以形成课程改革的方案。
A.
正确
B.
错误
查看完整题目与答案
【单选题】The existence of external economies of scale
A.
focuses more on individual firms than the industry as a whole.
B.
tends to result in one huge monopoly.
C.
tends to result in large profits for each firm.
D.
cannot be associated with a perfectly competitive industry.
E.
may be associated with a perfectly competitive industry.
查看完整题目与答案
【简答题】外部规模经济(external economies of scale)
查看完整题目与答案
【单选题】In the presence of external economies of scale, trade
A.
may or may not improve welfare in both countries.
B.
will unambiguously improves welfare in both countries.
C.
will unambiguously worsens welfare in both countries.
D.
will unambiguously worsen welfare in the exporting country and improve welfare in the importing country.
E.
will unambiguously improve welfare in the exporting country and worsen welfare in the importing country.
查看完整题目与答案
【简答题】设微分方程通解为y=C 1 +lnC 2 x，试讨论怎样给定初始条件，可得唯一特解，以及特解的定义域．
查看完整题目与答案
相关题目：
【单选题】The existence of external economies of scale _______.
A.
tends to result in large profits for each firm.
B.
may be associated with a perfectly competitive industry.
C.
cannot be associated with a perfectly competitive industry.
D.
tends to result in one huge monopoly.
查看完整题目与答案
【简答题】External economies外部经济
查看完整题目与答案
【单选题】The existence of external economies of scale
A.
may be associated with a perfectly competitive industry.
B.
cannot be associated with a perfectly competitive industry.
C.
tends to result in one huge monopoly.
D.
tends to result in large profits for each firm.
E.
focuses more on individual firms than the industry as a whole.
查看完整题目与答案
【多选题】停留服务期间。全陪应做好协助地陪的各项工作,保障旅游者的安全包括一下哪些方面()
A.
汇报旅游团情况，配合地陪做好工作
B.
维护保障游客的安全
C.
检查各站的服务质量
D.
增加游客的购物次数
查看完整题目与答案
【单选题】External economies of scale ( )
A.
may be associated with a perfectly competitive industry.
B.
cannot be associated with a perfectly competitive industry.
C.
tends to result in one huge monopoly.
D.
tends to result in large profits for each firm.
查看完整题目与答案
【判断题】对慕课课程设计者来说，了解论坛参与者的特征、行为和利用论坛的方法，可以找出现有课程的不足，还可以形成课程改革的方案。
A.
正确
B.
错误
查看完整题目与答案
【单选题】The existence of external economies of scale
A.
focuses more on individual firms than the industry as a whole.
B.
tends to result in one huge monopoly.
C.
tends to result in large profits for each firm.
D.
cannot be associated with a perfectly competitive industry.
E.
may be associated with a perfectly competitive industry.
查看完整题目与答案
【简答题】外部规模经济(external economies of scale)
查看完整题目与答案
【单选题】In the presence of external economies of scale, trade
A.
may or may not improve welfare in both countries.
B.
will unambiguously improves welfare in both countries.
C.
will unambiguously worsens welfare in both countries.
D.
will unambiguously worsen welfare in the exporting country and improve welfare in the importing country.
E.
will unambiguously improve welfare in the exporting country and worsen welfare in the importing country.
查看完整题目与答案
【简答题】设微分方程通解为y=C 1 +lnC 2 x，试讨论怎样给定初始条件，可得唯一特解，以及特解的定义域．
查看完整题目与答案
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