近些年来，国民生产总值稳步增长，既实现了经济快速增长，又有效( )了通货膨胀，避免了大起大落。
A．控制
B．抑制
C．制止
D．停止
参考答案：B
Jack has been feeling down recently . I wonder that is making him so upset .
A．what is it
B．why is it
C．why it is
D．what it is
电池组连接完成后，若不马上加电，应使电源与蓄电池处于（）状态，防止蓄电池严重过放电
A、连接状态
B、断开状态
