给出三个命题 ① 若两条直线和第三条直线所成的角相等,则这两条直线互相平行. ② 若两条直线都与第三条直线垂直,则这两条直线互相平行. ③ 若两条直线都与第三条直线平行,则这两条直线互相平行. 其中不正确命题的个数是( )
A.
0
B.
1
C.
2
D.
3
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【单选题】In 1994,the definition of the field has been published by AECT:“Instructional Technology is the theory and practice of design,( ) ,utilization,management and evaluation of processes and resource...
【简答题】In 1994,the definition of the field has been published by AECT:“Instructional Technology is the theory and practice of ( ),( ),( ), ( ) and ( ) of processes and reso...
【简答题】AECT 1994 definition: Instructional technology is the ( ) and ( ) of design, ( ), utilization, ( ) and evaluation of processes and ( ) for learning.