阀控式密封铅酸蓄电池充电时，正极产生的（）在负极上吸叫还原成水
A.氧气
B.二氧化碳
C.氯气
D.氮气
参考答案：A
A series of stimulus policies and supportive measures taken by the government _____ to promote change in the economic environment in this area.
A．are expecting
B．are expected
C．is expecting
D．is expected
□17÷8，要使商是两位数，□里最大可以填（ ）；要使商是三位数，□里最小可以填（ ）。
