问题
单项选择题
在傅立叶变换红外光谱仪由于光源硅碳棒的原因引起光通量不稳，激光通量下降，应（）。
A.重新接光源的引出线，使接触良好
B.更换发射能力好的激光管
C.提高激光电源的供电电压
D.以上都不对
答案
参考答案：A
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在傅立叶变换红外光谱仪由于光源硅碳棒的原因引起光通量不稳，激光通量下降，应（）。
A.重新接光源的引出线，使接触良好
B.更换发射能力好的激光管
C.提高激光电源的供电电压
D.以上都不对
参考答案：A
| 根据句意及首字母提示补全单词。 1. After Tom d _____ the strange cooking pot in his back yard, a lot of people came and tried to find something more. 2. There have been great changes in our city. We can see a lot of tall b _____ here and there. People have a better life now. 3. Mrs. White spoke so fast that some of us couldn't f _____ her at all. 4. After half a year's practice, he really made much p _____ in English. 5. She stayed at home and looked after her baby instead of s _____, though she did need some clothes. |