气体理想状态方程为（）。
A、PT/V=常数
B、PV/T=常数
C、TV/P=常数
D、PVT/T=常数
参考答案：B
Recently a survey _______ prices of the same goods in two different supermarkets has caused heated debate among citizens.
A．compared
B．comparing
C．compares
D．being compared
解方程：（2x-3）2-2（2x-3）=3
y _______ prices of the same goods in two different supermarkets has caused heated debate among citizens.