单项选择题 根据12633=378，下面（）算式结果正确。A. 12.633=3.78B. ...

单项选择题 【单选题】使用螺旋测微计测量物体时，（ ）发出咔咔响声时方可读书？

未知题型 13. If you are in China, to improve your listening and speaking, you attend lectures given by foreign people.