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【单选题】
若x 1 ，x 2 是一元二次方程3x 2 +x-1=0的两个根，则 1 x 1 + 1 x 2 的值是（ ）A.
-1
B.
0
C.
1
D.
2
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反馈参考答案：
举一反三
【多选题】中国人民银行为执行货币政策，可以运用下列货币政策工具，包括()
A.
要求银行业金融机构按照规定的比例交存存款准备金
B.
为在中国人民银行开立账户的非银行金融机构办理再贴现
C.
确定中央银行基准利率
D.
在公开市场上买卖国债、其他政府债券和金融债券及外汇
【单选题】Where and when was the first McDonald’s built? It was built in in .
A.
Downey, California 1953
B.
Disney, California 1954
【判断题】A new car produced in 2011, but first sold in 2012, should be counted in 2012 GDP because that is when it was first sold as a final good
A.
正确
B.
错误
【单选题】What was the main use of the compass when it was first invented?
A.
As a child's game for the young emperor
B.
To keep the army straight during battles
C.
For city planning
D.
To help when lost in the woods
E.
For drawing straight lines
【简答题】Why is it that Wolco was expected to conquer the world when it was first opened in 1962?
【单选题】Iron production was revolutionized in the early eighteenth century when coke was first used instead of charcoal(木炭)for refining iron ore. Previously the poor quality of the iron had restricted its use...
A.
Advances in iron processing in the eighteenth and nineteenth centuries.
B.
The effects of the Industrial Revolution on traditional architectural styles.
C.
Advantages of stone and timber over steel as building materials.
D.
The evolution of the use of iron in architecture.
【单选题】When aluminum was first produced about a hundred and fifty years ago, it was so difficult to separate from the ores(矿石) in which it was found that its price was higher than that of gold. The price rem...
A.
wind power
B.
solar energy
C.
hydraulic power
D.
electricity
【单选题】Iron production was revolutionized in the early eighteenth century when coke was first used instead of charcoal(木炭) for relining iron ore. Previously the poor quality of the iron had restricted its us...
A.
Advances in iron processing in the eighteenth and nineteenth centuries.
B.
The effects of the Industrial Revolution on traditional architectural styles.
C.
Advantages of stone and timber over steel as building materials.
D.
The evolution of the use of iron in architecture.
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