垄断厂商的均衡如图所示，在Q1点厂商（）
参考答案：
A、获得最大利润
B、价格确定在P1
C、价格确定在P1
D、利润等于（P1-P2）Q1
On Sundays there were a lot of children playing in the park, and _______ parents were seated together joking.
A．their
B．whose
C．which
D．that
A．生物传感器
B．红外传感器
C．温度传感器
D．压力传感器
