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【简答题】
机械加工中产生的振动主要有 和 两大类。
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反馈参考答案：
举一反三
【单选题】18 世纪中期西方大学开始设立教育学讲座,教育学逐渐从哲学中分离出来,正式成为了一门独立的学科,为有志于从事教师职业的学生提供理论指导。标准着规范教育学建立的著作 是( )
A.
. 《普通教育学》
B.
.《民主主义与教育》 》
C.
《大教学论》
D.
《爱弥儿
【单选题】（全国卷 1 ） 34 ． The coffee is wonderful ! It doesn’t taste like anything I _____ before.
A.
． was having
B.
． have
C.
． have ever had
D.
． had ever had
【判断题】1879年,德国哲学家、生物学家、心理学家冯特在莱比锡大学建立了第一个心理实验室,开始系统地用实验手段研究人的心理状态,使心理学作为一门独立的学科从哲学中分离出来。
A.
正确
B.
错误
【单选题】Which of the following statements is true of the vocal cords?
A.
In male adults the vocal cords are typically longer than in female adults.
B.
In male adults the vocal cords are typically shorter than in female adults.
C.
In male adults the vocal cords are typically thinner than in female adults.
D.
The vocal cords in both male and female adults are of the same lengt
【简答题】n. a male cow
【单选题】Which of the following statements is true of the vocal cords?
A.
In male adults the vocal cords are typically longer than in female adults.
B.
In male adults the vocal cords are typically shorter than in female adults.
C.
In male adults the vocal cords are typically thinner than in female adults.
D.
The vocal cords in both male and female adults are of the same length.
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