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【单选题】
渐开线标准直齿圆柱齿轮与齿条啮合时，其啮合角恒等于齿轮的压力角。A.
基圆
B.
分度圆
C.
齿顶圆
D.
齿根圆
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【简答题】Why doesn’t the unemployment rate ever reach zero? Economists, who generally believe that supply tends to meet demand, have long thought about this question. Even in good times, i.e. not now, there ar...
【判断题】Economists generally believe that policies such as reducing barriers to trade are likely to foster economic growth.
A.
正确
B.
错误
【判断题】Economists generally believe that inward-oriented policies are less likely to foster growth than outward-oriented policies.
A.
正确
B.
错误
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A.
正确
B.
错误
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A.
正确
B.
错误
【单选题】Economists have generally found that economic growth rates have a close relation to:
A.
openness to trade
B.
education
C.
communications infrastructure
D.
all of these
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