【单选题】在一般工作条件下,齿面硬度HB≤350的闭式钢制齿轮传动,通常的主要失效形式为
【单选题】Tom asked my friend ____.
B.
that the earth is bigger than the moon
【单选题】Tom asked my friend_______.
B.
that the earth was bigger than the moon
【判断题】When watching wuxia films, we usually care about the female characters most.