During periods of rising prices, which of the following statements is correct A: LIFO COGS ＞ weighted average COGS ＞ FIFO COGS B: LIFO COGS = weighted average COGS = FIFO COGS C: LIFO COGS ＜ weighted average COGS ＜ FIFO COGS

The average of a firm's cost of equity and after tax cost of debt that is weighted based on the firm's capital structure is called the: A: reward to risk ratio B: weighted capital gains rate C: structured cost of capital D: weighted average cost of capital

Entropy<br/>is a weighted average of self-information of different messages。

A second area wherein the weighted property(加权特性) is useful is in numerical display.

【多选题】若f 1 (t) = ɛ (-t) , f 2 (t) = e t ,则f 1 (t)* f 2 (t) = A. f 1 ꞌ (t)* f 2 (–1) (t) B. f 1 (–1) (t)* f 2 ꞌ (t) C. f 1 (t-3)* f 2 (t+3) D. f 1 (–3) (t)* f 2 ꞌꞌꞌ (t)

设α1=(1，1，2，2)T，α2=(t，t+2，2t+2，2t+4)T，α3=(1，a+1，2a+3，2a+2)T，α4=(-2，-3，2t-9，t-7)T，若（）成立，α1，α2，α3，α4线性无关。 A: t=1，且a=-1 B: t=1，或a=-1 C: t≠1，且a≠-1 D: t≠1，或a=-1

Which ONE of the following statements is correct? A: EPS= (Net income - Preferred dividends) / weighted average number of common shares outstanding B: EPS= Net income / weighted average number of common shares outstanding C: EPS= (Net income - Preferred dividends) / ending number of common shares D: EPS= (Net income - common dividends) / weighted average number of preferred shares outstanding

A weighted average of the value of a random variable, where the probability function provides weights is known as

已知α1=(1，0，1)T，α2=(0，4，-1)T，α3=(-1，2，0)T，且Aα1=(2，1，1)T，Aα2=(-3，0，4)T，Aα3=(1，-1，1)T，则A=______．

齐次线性方程组的基础解系为（）。 A: α1=（1，1，1，0）T，α2=（-1，-1，1，0）T B: α1=（2，1，0，1）T，α2=（-1，-1，0）T C: α1=（1，1，1，0）T，α2=（1，0，0，1）T D: α1=（2，1，0，1）T，α2=（-2，-1，0，1）T