问题
多项选择题
检测光纤设备仪表有（）。
A、光源
B、光功率计
C、光时域反射仪
D、频率计
答案
参考答案：A, B, C
搜题请搜索小程序“爱下问搜题”
检测光纤设备仪表有（）。
A、光源
B、光功率计
C、光时域反射仪
D、频率计
参考答案：A, B, C
When I walked into McCarley’s Bookstore in Ashland, Ore, I began to scan titles on the shelves. The man behind the counter, Mac McCarley, asked if I’d like . I said yes because I needed to for college. I worked after school and during summers, and the job helped pay for my freshman year of college. I would work many other jobs: I made coffee in the Students’ Union college and even made maps for the US Forest Service. But selling books was one of the most One day a woman asked me for on cancer. She seemed fearful. I showed her everything we had in and found other books we could . She left the store , and I’ve always remembered the I felt in having helped her. Years later, as a in Los Angeles, I heard about an immigrant （移民）child who was born with his thumb attached, weblike, to the rest of his hands. His family couldn’t a corrective operation, and the boy lived in , hiding his hand in his pocket. I my boss to let me do the . After my story was broadcast, a doctor and a nurse called, to perform the operation for free. I visited the boy in the recovery room after the operation. The first thing he did was hold up his hand and said , “Thank you.” I felt a sense of reward. At McCarley’s Bookstore I always sensed I was working for the , not the store. Today it’s . NBC News pays my salary, but I feel as if I work for the , through my “Today” show, helping them make of the world.
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