函數(shù)的定義域是

    A. B.    C. D.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         

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若函數(shù)有兩個(gè)不同的零點(diǎn),則實(shí)數(shù)的取值范圍是

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己知一個(gè)正三棱錐的正視圖為等腰直角三角形,其尺寸如圖所示,則其側(cè)視圖的周長(zhǎng)為_(kāi)_______________.

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