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问题 单项选择题

YJ19供料系统吸丝带传动轮系统由一系列刮刀进行清洁，这些刮刀可以清除粘在吸丝带轮槽底或（）上的烟丝或烟垢。

A.吸丝带表面

B.轮子表面上

C.烟丝护板表面

D.吸丝带轮侧面

答案

参考答案：B

填空题

物理学是研究光、热、力、声、电等______的规律和物质结构的一门科学．
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单项选择题

During the risk analysis process, it is determined that one identified risk event cannot be avoided, mitigated, or insured. This risk event is a critical item that could cause the project to fail if it occurs. The best option for the project manager is to: (73) .

A．Continue to search for an insurance company that would assume the risk

B．Place special emphasis on the risk event to intensely manage that item and all interfacing items

C．Play down the risk and the team will find a means of overcoming any failure

D．Ignore the risk assessment because any assigned value is a point estimate which is never precisely the expected state of nature
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