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问题 解答题

天水市某蔬菜基地有120吨新鲜蔬菜，计划用A，B两种货运车运往外地销售，已知A种车能装载5吨，B种车能装载6吨．

（1）若有A，B两种车共22辆，在满载情况下，能将这些蔬菜全部运完，那么A，B两种车各有多少辆？

（2）若A种车每辆每趟运费为1500元，B种车每辆每趟运费为1700元，要在车辆满载、且总运费不超过34 500元的情况下，将蔬菜全部运完．应怎样选择最佳配车方案？

答案

（1）设A，B两种车分别有x，y辆．

则：

x+y=22
5x+6y=120

解得：

x=12
y=10

答：A，B两种车分别用12，10辆．

（2）∵1500÷5=300（元）

1700÷6=283

1
3
（元）

那当然选择B种车划算．

120÷6=20（辆/次）

运费：1700*20=34 000（元）

问答题

Ari operates a business as a designer of internet web pages for a variety of business clients. Unfortunately he has had some difficulty in recovering his full fees from a number of clients as follows:(a) Bi, a newly qualified accountant, told Ari that although she could only raise the cash to pay half of the outstanding fees she would, as an alternative to paying the other half, do all of Ari’s accountancy work for the coming year. Ari reluctantly agreed to this proposal.(b) Cas, a self-employed musician, told Ari that she could not pay any of the money she owed him. However, her father offered to pay Ari, but could only manage half of the total amount owed. Once again Ari reluctantly agreed to accept the father’s payment of the reduced sum.(c) Dex, a self-employed car mechanic, without contacting Ari, simply sent him a cheque for half of his fees stating that he, Dex, could not pay any more and that the cheque was in full settlement of his outstanding debt.Ari himself is now in financial difficulty and needs additional cash to maintain his business operation.Required:Advise Ari whether, in the context of contract law, he can recover any of the outstanding money from Bi, Cas and Dex. (10 marks)
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单项选择题

急性一氧化碳中毒诊断最可靠的依据是（）

A.一氧化碳接触史

B.突然昏迷

C.皮肤粘膜呈樱桃红色

D.血液碳氧血红蛋白实验呈阳性

E.排除其它中毒性疾病
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