已知∠I=40°,则∠I的余角度数是
A.150°
B.140°
C.50°
D.60°
C.
题目分析::∵∠1=40°,
∴∠1的余角=90°-∠1=90°-40°=50°.
故选C.
外存储器又称辅助存储器,用来永久地存放大量的程序和数据。( )
The Audiolingual Method develops the separation of the language ______ into a pedagogical device, that is, listening, speaking, reading and writing.