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【简答题】
只要将接入三相电源的定子三相绕组中的任意______,就能改变旋转磁场的转向,从而改变电动机的旋转方向。
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It’s nine
D.
It’s zero
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is; It’s          
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are; It’s       
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are; They’re
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【简答题】Perry lives on avocados and beans. The price of avocados is $10, the price of beans is $5, and his income is $40. Show Perry’s budget line on a graph with avocados on the horizontal axis and beans on ...
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【单选题】—What’s the date today? —____. [     ]
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It’s Sunday
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It’s June 20
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【单选题】In the production function graph, with output per worker on the vertical axis and capital per worker on the horizontal axis, the slope is
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positive and gets steeper as capital increases.
B.
positive and gets flatter as capital      increases
C.
positive and has constant slope
D.
Is a horizontal line above the axis.
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【单选题】If the price of bread is zero, a budget line between bread (on the vertical axis) and cheese (on the horizontal axis) would ( )
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C.
coincide with the horizontal axis.
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【单选题】Considering a PPF with health care services on the vertical axis and other goods and services on the horizontal axis, the increasing production of health care services in the United States as a result...
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a movement upward along the PPF.
B.
an outward shift of the PPF from the vertical axis.
C.
an outward shift of the PPF from the horizontal axis.
D.
a movement downward along the PPF.
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【单选题】左外连接查询使用的关键字是()。
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【单选题】—This is ______ eraser. —______ her eraser.
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a; It’s           
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an; Its      
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an; It’s
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【单选题】-What’s seven and two? -________. [     ]
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