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11个月前
Had he worked harder, he ________ the exam. [ ]
1年前
Professor White has written some short stories, but he is _____ for his plays.
1年前
A human ______ can do some things better than a computer, for example, creating new ideas.
1年前
已知一对外啮合标准直齿圆柱齿轮传动的标准中心距a=108mm,传动比i12=3,小齿轮齿数Z1=18。试确定大齿轮的齿数Z2、齿轮的模数m和两轮的分度圆直径。
1年前