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【单选题】
齿轮用滚针轴承装在轴上时
A.
轴转动，齿轮被带动转动
B.
齿轮转动，轴被带动转动
C.
齿轮转动，轴没有被带动转动
D.
轴转动，可能带动齿轮一起转动
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参考答案：
参考解析：
刷刷题刷刷变学霸
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.