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浅成低温热液型贵金属矿床其特征？

答案

参考答案：

目前主要特指产于陆相火山岩系中或相邻岩石中，绝大多数情况下成矿温度小于150℃极少数情况下可达300℃，矿床形成的主要深度主要集中在地表下1mK，个别情况下可达2mK，成矿流体主要为大气降水与岩浆水的混合热液的一类金、银矿床。

多项选择题

5.Greenfields Co specialises in manufacturing equipment which can help to reduce toxic emissions in the production of chemicals. The company has grown rapidly over the past eight years and this is due partly to the warranties that the company gives to its customers. It guarantees its products for five years and if problems arise in this period it undertakes to fix them, or provide a replacement product.You are the manager responsible for the audit of Greenfields and you are performing the final review stage of the audit and have come across the following two issues.Receivable balance owing from Yellowmix CoGreenfields has a material receivable balance owing from its customer, Yellowmix Co. During the year-end audit, your team reviewed the ageing of this balance and found that no payments had been received from Yellowmix for over six months, and Greenfields would not allow this balance to be circularised. Instead management has assured your team that they will provide a written representation confirming that the balance is recoverable.Warranty provisionThe warranty provision included within the statement of financial position is material. The audit team has performed testing over the calculations and assumptions which are consistent with prior years. The team has requested a written representation from management confirming the basis and amount of the provision are reasonable. Management has yet to confirm acceptance of this representation.Required:

(c) The directors of Greenfields have decided not to provide the audit firm with the written representation for the warranty provision as they feel that it is unnecessary.Required:Explain the steps the auditor of Greenfields Co should now take and the impact on the audit report in relation to the refusal to provide the written representation. (5 marks)
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单项选择题

一个口语表达和听理解损害不明显的脑卒中患者却不能重复别人所说的话，这种言语障碍为（）

A.Broca失语

B.Wernicke失语

C.传导性失语

D.命名性失语

E.混合性失语
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