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【简答题】

高副主要有____、凸轮接触和齿轮接触等。

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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】按照构件的接触形式,运动副分为低副和高副两类,那么什么是高副?

A.
点或线接触的运动副
B.
面接触的运动副
C.
任何接触形式的运动副
D.
曲面接触的运动副

【多选题】下列属于高副的是

A.
转动副
B.
螺旋副
C.
齿轮副
D.
凸轮副