（）是指电力系统重要的电压支撑点。
A、电压中枢点
B、电压考核点
C、电压监测点
D、无功补偿点
参考答案：A
–How come ___________?—I had to look after my sick brother.
A．didn’t you come to the party yesterday
B．did you not come to the party yesterday
C．you didn’t come to the party yesterday
D．you came to the party yesterday
植物从缺氧环境中移到空气中，TCA循环则（）。
A.加快
B.减慢
C.不变
