已知等比数列{an}中,an>0,a1,a9为方程x2﹣10x+16=0的两根,则a2a5a8的值为( )[ ]
A.32
B.64
C.128
D.256
答案:B
You've failed to do what you ()to and I'm afraid the teacher will blame you.
A. will expect
B. will be expected
C. expected
D. were expected
在如图所示的逻辑电路中,当A端输入电信号“1”,B端输入电信号“1”时,则在C端和D端输出的电信号分别为______和______.