fluorhydrichydrofluoric氟化氢: hydrogen fluoride的: 4次方是 The fourth power of 2 i ...氟化氢: hydrogen fluoride◇氟化氢回收设备 hydrogen fluoride recovery plant氯化氢的: hydrochloric二氟化氢钠: sodium hydrogen difluoride下载手机词典可随时随地查词查翻译