问题
单项选择题
AT-401在线色谱仪恒温温度是（）℃
A.80℃
B.55℃
C.65℃
D.60℃
答案
参考答案：A
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AT-401在线色谱仪恒温温度是（）℃
A.80℃
B.55℃
C.65℃
D.60℃
参考答案：A
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| My aunt works in Beijing. I visited her during last summer vacation. Beijing is a beautiful city. A lot of foreigners go sightseeing there. My aunt and I got up early on Saturday morning and we went to the Great Wall by car. We returned to the center of the city at four and visited the Palace Museum. The next morning we went to the Summer Palace by bike. That afternoon, we rode to the Beijing Zoo. We saw pandas there. And after supper we took a bus to Beihai Park. We were tired, but I think we had a good time there.
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