A __________ changes the up-and-down motion of the pistons into spinning motion.
举一反三
- It is held in the crankcase in the cylinder block and converts the reciprocating motion of the pistons into a rotary motion for the drive wheels．
- A semi-open motion is also semi-closed motion.
- In terms of scope or range, debate motions fall into three categories: open motion, closed motion and semi-closed/semi-open motion.
- The projection on a shaft designed to change circular motion into up and down or back and fore motion is called （）. A: wheel B: crankshaft C: running gear D: cam
- If a motion repeats after equal intervals of time, it is called a ( ) motion.