问题
单项选择题
在进行SDH的误码测试时，当误码率低于以下哪项标准时则认为系统误码指标合格：（）.
A.10e3
B.10e6
C.10e9
D.10e12
答案
参考答案：D
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在进行SDH的误码测试时，当误码率低于以下哪项标准时则认为系统误码指标合格：（）.
A.10e3
B.10e6
C.10e9
D.10e12
参考答案：D
In the doctor’s waiting room, sick men and women were sitting on the chair. Bob, a school boy, was among them. They all looked very sad Bob. He lost himself in an story in a magazine. Just then the doctor came in and said he was ready the next person. Bob jumped up and the doctor's room. “What’s your trouble?” asked the doctor. Before Bob could say a word, the doctor made him on the bed. “Now I’ll listen to your heart beat.” Bob tried to speak, but the doctor told him not to anything. “I’ll your temperature.” Bob tried , but the doctor stopped him. After a moment, the doctor said, “Well, boy, don’t . There is with you.” “I know,” said Bob. “I just come to fetch(取) some medicine for my father.”
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