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问题 选择题

不能用水浴加热的实验是（  ）

A．苯的硝化反应

B．银镜反应

C．制酚醛树脂

D．由乙醇制乙烯

答案

答案：D

题目分析：水浴加热最高温度为100℃，而由乙醇制乙烯需要的温度为170℃，故不能用水浴加热。

问答题

Clare, Dan and Eve formed a partnership 10 years ago, although Clare was a sleeping partner and never had anything to do with running the business. Last year Dan retired from the partnership. Eve has subsequently entered into two large contracts. The first one was with a longstanding customer Greg, who had dealt with the partnership for some five years. The second contract was with a new customer Hugh. Both believed that Dan was still a partner in the business. Both contracts have gone badly wrong leaving the partnership owing ￡50,000 to both Greg and Hugh. Unfortunately the business assets will only cover the first ￡50,000 of the debt.Required:Explain the potential liabilities of Clare, Dan, and Eve for the partnership debts. (10 marks)
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问答题 简答题

什么叫保护接地？其安全原理是什么？
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