在如图所示的图形中,A弧长为多少?()
A.80.89
B.88.09
C.40.44
D.45.04
参考答案:A
In C language()consists of variables and constants connected by operators.
A.an expression
B.a subroutine
C.a function
D.a loop
银纹产生于()
A.玻璃态拉伸
B.纤维束断裂
C.局部屈服
D.裂纹扩展