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【简答题】

斜齿轮按螺旋线的旋向不同可分为____和____。

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参考解析:
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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】圆柱螺旋线的形状和大小是由()三要素决定的。

A.
圆柱直径、导程、旋向
B.
圆锥直径、导程、旋向
C.
圆柱直径、圆柱长度、导程
D.
圆柱直径、圆柱长度、旋向