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【单选题】

单个渐开线齿轮的基本参数是( )

A.
齿数、模数和压力角
B.
齿数、模数和中心距
C.
压力角、模数和中心距
D.
齿数、压力角和中心距
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参考解析:
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举一反三

【单选题】Passage 3 Questions 11 to 15 are based on the following passage: Scientists in India have invented a new way to produce electricity. Their invention does not get its power from oil, coal or other fuel...

A.
Because bullocks have long been used by Indian people
B.
Because bullocks walk slowly and are easy to control.
C.
Because there are few non-working bullocks in India
D.
Because there is not enough oil in India.

【单选题】晶体管中的“β”参数是()。

A.
电压放大系数
B.
集电极最大功耗
C.
电流放大系数
D.
功率放大系数