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【简答题】

齿轮堆焊后如何进行回火处理?

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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.

【单选题】应用较广泛的深度处理技术不包括______。

A.
活性炭吸附
B.
生物接触氧化
C.
生物活性炭
D.
臭氧氧化