【多选题】用标准齿条形刀具范成加工标准齿轮时,关于根切产生原因叙述正确的是_______。
【单选题】The experiment turned out to be a complete failure, _____ wasn’t _____ they expected.
【单选题】用 标准 齿条形刀具 范 成加工标准齿轮时, 关于 根切产生原因 叙述错误的 是 _______ 。
【单选题】用齿条形刀具范成加工标准齿轮时,齿轮产生根切的原因是( )。
【单选题】— To my disappointment, the experiment was ______ complete failure. — Don't lost ______ heart, John. Failure is the mother of success. [ ]
【单选题】— Why didn’t they complete the task in time? — Because it was not until late afternoon _____ they began to solve the major problem.
【单选题】Gates didn’t complete university.