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【单选题】

滚齿运动可视为()

A.
一对直齿圆柱齿轮啮合
B.
一对斜齿轮啮合
C.
蜗轮蜗杆啮合
D.
齿轮齿条啮合
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题目标签:可视运动滚齿
参考答案:
参考解析:
.
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【单选题】在下列关于肌的起止、运动的描述中,以下哪项是错误的()

A.
运动时,多以起点为动点
B.
肌的起止点是相对的,可以互换
C.
四肢肌的起点多相对靠近肢体的近端
D.
躯干肌的止点多相对远离身体的正中线
E.
一块肌的起止点间可跨过多个关节

【单选题】What is World English World English is a course in the English language. It is intended for students whose native lauguage is not English. It is a basic programme consisting of six stages. Each stage ...

A.
What is World English
B.
World English is a course in the English language. It is intended for students whose native lauguage is not English. It is a basic programme consisting of six stages. Each stage includes a Student Book, a Teacher’s Book, a Workbook, and cassette recordings. World English is further supported by separate books of readings, by tests, and by visual (可视的) aids.
C.
Who is World English for
D.
World English may be entered at any one of three different levels. The First Level, Books One and Two, is intended for students with little or no education in English. Books Three and Four make up the Second Level; they are suitable for students who have some knowledge of English. The Third Level, Books Five and Six, is intended for students who are concerned with improvement in the language.
E.
What does World English teach
F.
World English teaches four basic skills of language: listening, speaking, reading, and writing. At all levels, each skill is presented systematically. In the First Level, listening and speaking receive more attention. In the latter books, reading and writing become more important. However, reading and writing activities are presented even in Unit One of Book One; and listening and speaking exercises occur through Unit Ten of Book Six.

【多选题】滚齿时,齿轮基节超差的原因是()。

A.
齿坯安装偏心
B.
分度蜗轮误差大
C.
分度蜗杆松动
D.
升降丝杠松动
E.
工作台下压板间隙大

【多选题】Z37摇臂钻床的辅助运动有

A.
摇臂绕立柱的旋转
B.
摇臂沿着立柱的升降
C.
主轴箱沿着摇臂的移动
D.
刀具沿着主轴的上下移动