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【单选题】

Imagine you are at the doctor’s, and the doctor is giving you advice. Listen to the doctor and choose the best answer.103

A.
You’ve got the flu.
B.
You should stop working for three days.
C.
/
D.
You should take some medicine and stay in bed.
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参考答案:
参考解析:
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举一反三

【多选题】Listen and choose the FOUR web sites that Bernie visited today.

A.
buymusic.com
B.
findafriend.info
C.
dailynews.com
D.
californiabank.com

【多选题】光纤光栅传感器与其它光纤传感器相比的特点主要有

A.
波长载信息的特点使光纤光栅传感器的输出与光源的光功率、光源光功率的波动、光纤的连接损耗无关。
B.
利用波分复用技术可以方便地构成传感网络。
C.
传感网络中传感点的个数受光源谱宽的限制。
D.
能够抗腐蚀、抗电磁干扰。