守恒
参考答案：当物体的外观在某些表面上发生变化时，仍能够认识到物体的本质没有发生变化。
Anyone ______ trying to take knives on board flights would be caught by the police.
A．finds
B．being found
C．found
D．will find
若方程3x4n﹣3+5=0是一元一次方程，则n=（ ）．
