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【单选题】
According to management expert Peter Drucker, we can get the conclusion that:A.
Many people (about thirty five percent in most organizations) spend much of their time doing the wrong thing very well.
B.
Many people (about thirty five percent in most organizations) spend much of their time doing the right thing very well.
C.
Many people (about fifty percent in most organizations) spend much of their time doing the wrong thing very well.
D.
Many people (about fifty percent in most organizations) spend much of their time doing the right thing very well.
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【简答题】当直线（或平面）平行于投影面时，其投影为一点（直线），这种性质叫（）
【简答题】当直线(或平面)平行于投影面时,其投影 为一点(直线) ,这种性质叫 性
【简答题】当直线或平面图形平行于投影线时,如果是正投影,则垂直于投影面,其平行投影积聚为一点或一直线,这种特性称为 。
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