若一条直线平行于平面内的任一直线,则此直线与该平面平行。( )
A. 对
B. 错
若一平面上的两平行直线对应平行于另一平面上的两平行直线,则这两平面相互平行。( )
A. 对
B. 错
若两特殊位置平面相互平行,则它们具有积聚性的那组投影必相互平行。( )
A. 对
B. 错
Audience adaptation is an important factor in which of the following steps of the speechmaking process?1
A. formulating a specific purpose
B. writing an introduction and conclusion
C. choosing visual aids
D. all of the above
E. a and b only