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【单选题】
紫外-可见分光光度法的适宜波长范围是( )A.
200-400nm
B.
200-800nm
C.
200-760nm
D.
360-800mm
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【单选题】关于材料的弹性模量,下列说法正确的是
A.
金属材料>无机非金属材料>高分子材料
B.
无机非金属材料>金属材料 >高分子材料
C.
高分子材料>无机非金属材料>金属材料
D.
无机非金属材料>高分子材料>金属材料
【简答题】An experimental solar-powered plane landed safely Thursday after completing its first 24-hour test flight, proving that the aircraft can collect enough energy from the sun during the day to stay aloft...
【简答题】Recently，a solar powered（太阳能动力的）plane took to the sky for the first time. It had passed an important test on the way to travel around the world. The plane took off from an airport in Switzerland（瑞士）at...
【单选题】—Your picture is very good. —_______. [ ]
A.
No, it is not good
B.
OK, you’re right
C.
Thank you
D.
Thanks you
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