问题
单项选择题
OTDR测量时选取适当的测试距离可以产生比较全面的轨迹图，通常根据经验，选取整条光路长度的（）倍之间最为合适。
A.0.5~1
B.1~1.5
C.1.5~2
D.2~2.5
答案
参考答案：C
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OTDR测量时选取适当的测试距离可以产生比较全面的轨迹图，通常根据经验，选取整条光路长度的（）倍之间最为合适。
A.0.5~1
B.1~1.5
C.1.5~2
D.2~2.5
参考答案：C
| 阅读对话。 | |
| A: Hello! This is Linyi People's Hospital. 1________ B: This is Wang Qiang. Doctor Liu's friend.2________ A: I'm sorry. He isn't here at the moment. 3________ B: I have a bad headache. A: 4________ B: No, I haven't yet. A: 5________ B: Yes, something is wrong with it. A: You'd better come to the hospital and I will look you over carefully. B: OK. Thanks a lot! | |
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