I was in the middle of writing the essay when my computer suddenly stopped working properly. (go wrong) Something suddenly__________ with my computer when I was in the middle of writing the essay.
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参考答案:
举一反三
【单选题】If the projection of a cylinder on the projection plane perpendicular to its axis is a circle, the other two projections are ( )
【判断题】The horizontal projections and the frontal projections of two lines are parallel to each other respectively, and therefore these two lines must be parallel in space.