【单选题】He started when he was young. [ ]
【单选题】在某些自动变速器中,利用叶片式油泵可做成变量油泵,这是根据()原理而制成的。
【单选题】Usually he writes in ink and writes _______ his left hand.
【简答题】He writes to his mother once a month.(对划线部分提问)
【单选题】在某些自动变速器中,利用叶片式油泵可做成变量油泵,这是根据( )原理而制成的.
【单选题】He sometimes _____ e-mails _____ his friends. [ ]