A:by; for
B:by; at
C:as; at
D:as; for
《出师表》中最能表现诸葛亮感情的六个字是____,____。
Sit down and ___________ some water, please.
若|3x+2y﹣4|+27(5x+6y)2=0,则x,y的值分别是( )