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【简答题】

简述摆动齿轮盘车的工作原理?

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【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】固定翼飞行主要靠( )原理。

A.
浮力原理
B.
伯努利原理
C.
反作用力原理
D.
牛顿原理

【单选题】泡利不相容原理说明

A.
自旋量子数为半整数的粒子不能处于同一状态。
B.
自旋量子数为整数的粒子不能处于同一状态。
C.
自旋量子数为整数的粒子处于同一状态。
D.
自旋量子数为奇数的粒子处于同一状态。
E.
自旋量子数为半整数的粒子处于同一状态。

【单选题】后缘襟翼增升的共同原理是:

A.
增大了翼型的相对弯度
B.
增大了翼型的迎角
C.
在压力中心的后部产生阻力
D.
减小了翼型的阻力