只一推，就把他推进了河里。It took only one heave to hurl him into the river.他一推，门就开了。The door yielded easily when he pushed it.她把椅子往后一推，站了起来。She pushes back her chair and stands....
Zinc base die castings are always copper plated in cyanide baths.锌基合金的压铸件总是在氰化镀液中镀铜.It's used for the production of large castings.它用于大型铸件的制备.All lead castings were produced at first by hand in many cases from singl...