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24.如圖,ABCD為四面,已知 垂直於平面BCD, ,。若平面ADB 與平面ADC的夾角為θ,求sinθ之值? (A) (B) (C) (D)
問題詳情
24.如圖,ABCD為四面,已知
垂直於平面BCD,
,
。若平面ADB 與平面ADC的夾角為θ,求sinθ之值?
(A)
(B)
(C)
(D)
參考答案
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25. Cellulose fibers resemble with the protein structure in the form of:(A) β-sheets. (B) α-helices.
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26. Which description is correct?(A) Organisms which could use light as energy source are classified
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