mercury displacement pump造句

例句与造句

1. The study of vacuum then lapsed until 1855, when Heinrich Geissler invented the mercury displacement pump and achieved a record vacuum of about 10 Pa ( 0.1 Torr ).
2. Thereafter, research into the partial vacuum lapsed until 1850 when August Toepler invented the Toepler Pump and Heinrich Geissler invented the mercury displacement pump in 1855, achieving a partial vacuum of about 10 Pa ( 0.1 Torr ).
3. It's difficult to find mercury displacement pump in a sentence. 用mercury displacement pump造句挺难的