例句與造句

1. The tapped-hole rack was first replaced by clearance-hole ( Round Hole, Round Unthreaded Holes, and Versa Rail ) racks.
2. A bottoming tap is usually used to cut threads in a hole that has already been partially threaded using one of the more tapered types of tap; the tapered end ( " tap chamfer " ) of a bottoming tap is too short to successfully start into an unthreaded hole.
3. It's difficult to find unthreaded hole in a sentence. 用unthreaded hole造句挺難的