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在圆的周长C=2πR中,常量与变量分别是( )
若z= 12 + 32 i,且(x﹣z)4=a0x4+a1x3+a2x2+a3x+a4,则a2等于( )
读问句,选择对应的答句。
____①What's the weather like today? A. No, you can't.
____②Where are my books? B. Yes, it is.
____③What time is it? C. It's rainy.
____④Can I wear my new skirt? D. It's twelve o'clock.
____⑤Is it cool? E. They're on the bed.