靠水环泵引水的离心泵的最佳运行方式是______。
D
暂无解析
Evenwiththenewdevelopmentinresearch,onlyatiny________ofalltestsaredonewithoutusinganimals.
IntheGrammar-TranslationMethod,understandingandmemorizationof_____________wereregardedasimportantmeansofdevelopingmentality.
Peopleappreciate_______withhimbecauseheisknowledgeableandhumorous.