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为什么球墨铸铁的机械性能比普通灰铸铁好，而铸造性能却比普通灰铸铁差？

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在电气工程图中导线的敷设方式一般要用文字符号进行标注，其中CT表示（）

A. 穿焊接钢管敷设
B. 用塑料线槽敷设
C. 用电缆线桥架敷设
D. 穿金属软管敷设

The client team tends to bring the pSeries technical specialist in very late in the process. This has caused several problems where the specialist has had to correct some misunderstandings about the technology. The specialist is getting very frustrated and would like to avoid these misunderstandings in future. What would be the most appropriate way to handle this？（）

A. Refuse to work with the account team unless they are brought in right at the beginning.
B. Talk to the account team and ask them to bring them in earlier so that they can better understand the account.
C. Explain the situation to the customer and ask them to talk to the account team about bringing them in earlier.
D. Explain the situation to the sales manager and ask him to talk to the account team about bringing them in earlier.

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小红把平时节省下来的全部五分硬币先围成一个三角形，正好用完，后来又改围城一个正方形，也正好用完。如果正方形的每条边比三角形的每条边少用5枚硬币，则小红所有五分硬币的总价值是（）

A. 1元
B. 2元
C. 3元
D. 4元

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关于展青霉毒素，下列哪项是错误的（）

A. 是一种可由多种霉菌产生的有毒代谢产物
B. 在酸性溶液中不稳定
C. 可存在于霉变的面包、香肠、水果中
D. 首要的防治措施是防霉

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