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【多选题】
山东蓝宝石的特征吸收光谱是：（）A.
450，460，474nm
B.
437，460，470nm
C.
440，460，4740m
D.
450，460，494nm
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A.
Try to avoid all sources of light.
B.
Keep the room as dark as possible.
C.
Make note of unusual circumstances (状况).
D.
Be mindful of what you eat or drink before bed.
E.
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F.
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G.
If you wake up in the middle of the night, make an effort to have a comfortable position.
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A.
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B.
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C.
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D.
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