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问题 单项选择题

三个可靠度R均为0.8的部件串联构成一个系统，如下图所示，则系统的可靠度为（）。

A．0.240

B．0.512

C．0.800

D．0.992

答案

参考答案：B

解析：

串联系统可靠性模型，其可靠度为Rsys=R×R×R=0.83=0.512。

完形填空

Mrs. White works in a children’s hospital. There are many sick children and their parents in it. Mrs. White are friendly to them. She looks after(照料) her patients(病人) very well. Sometimes she gives some food to them. She likes the children and often tells stories to them. She likes to talk with them and play with them.

Mrs. White loves her job. She works hard and she is very busy every day. Sometimes she works late at night, but she’s always happy.

根据上面内容判断正误，正确的写T， 错误的写F。

小题1: Mrs. White is a shop assitant.

小题2: There are many sick children and parents in the children’s hospital.

小题3: Mrs. White gives her patients some food every day.

小题4:She loves working in the hospital.

小题5: She is busy but very happy
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填空题

影响OTDR测试时距离精度的因素有（）、（）、（）、（）、（）等。
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