High quality and improvement is key to our service.
A. continuous
B. skeptical
C. decisive
D. original
查看答案
The glass appears to light naturally.
A. repeat
B. refuse
C. reflect
D. reject
圆弧插补程序段中，当( )时，用-R表示圆弧半径。
A. 圆弧小于或等于180°
B. 圆弧大于或等于180°
C. 圆弧小于180°
D. 圆弧大于180°
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